WO2011076042A1

WO2011076042A1 - Communication system and method for updating system information in communication system

Info

Publication number: WO2011076042A1
Application number: PCT/CN2010/078676
Authority: WO
Inventors: 陈宪明; 关艳峰; 张磊; 谢峰; 宁丁; 刘颖
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-12-25
Filing date: 2010-11-12
Publication date: 2011-06-30
Also published as: JP5452721B2; JP2013502863A; CN102111855A; CN102111855B

Abstract

The present invention discloses a communication system, and a method for updating system information used in the communication system. Said communication system includes a control station and underling stations. The control station adjusts the transmission parameters or the transmission patterns of the system information; the control station transmits said system information to one or more underling stations according to the adjusted transmission parameters or transmission patterns. And then, the underling stations receive and read said system information. Applying the present invention can enable the underling stations to obtain or obtain as soon as possible and to apply the latest system configuration information or parameters, ensure the underling stations under the awakened or sleep pattern to work normally in the condition that the system configuration information or parameters are changed, and increase the system capability.

Description

Method for updating system information in communication system and communication system

Technical field

The present invention relates to the field of wireless communications, and in particular, to a communication system and a method for updating system information in a communication system.

Background technique

In a wireless communication system, a control station (e.g., a base station) is a basic unit constituting a wireless cell, and performs communication and management functions between a mobile communication network and a mobile communication user through an uplink/downlink and a subordinate station (e.g., a terminal) Communication is performed, wherein the downlink refers to the direction of the control station to the subordinate station, and the uplink refers to the direction of the subordinate station to the control station. Multiple subordinate stations can simultaneously transmit data to the control station through the uplink, or can simultaneously receive data from the control station through the downlink. In a wireless communication system in which a control station implements radio resource scheduling control, scheduling allocation of system radio resources is performed by a control station.

In the wireless communication system, in order to ensure that the subordinate station can complete cell selection and system access in an efficient manner, the control station usually needs to periodically transmit the time-critical system configuration information or parameters by using the system's downlink broadcast control channel. A collection, such as the use of a Super-Frame Header (SFH) in an 802.16m system. Depending on the operating scenario, the operator may change some system configuration information or parameters from time to time. During this period, the subordinate station needs to update and apply the necessary system configuration information or parameters in time to avoid affecting its normal data transmission. .

In addition, in order to achieve energy saving, a sleep mode is provided in most mobile or wireless communication protocols; the purpose of the sleep mode is to reduce the energy consumption of the mobile subordinate station and reduce the use of the air interface resources of the service control station. . The Sleep mode is a state in which the subordinate station temporarily suspends the service of the service control station within a predetermined period of pre-negotiating, that is, the control station does not unicast any form in the sleep window of the mobile subordinate station in the Sleep mode. The downlink service is given to the subordinate station.

For most wireless communication systems, the scheduling period of system configuration information or parameters is relatively fixed. For example, in 802.16m systems, system information is broadcast in SFH, where the superframe header is divided. Primary-SFH (P-SFH for short) and Secondary-SFH (S-SFH for short); where S-SFH is further divided into multiple sub-packets, for example, sub-package 1 (SP1) to sub-packet 3 (SP3), most of the system information is sent in these three sub-packets of S-SFH, and these sub-packets are not available in every superframe, specifically where to send these sub-packages depends on The scheduling period of different sub-packets preset by the control station.

Therefore, during the update of the system configuration information or parameters by the control station, the subordinate station cannot receive and apply the changed system configuration information in time due to the decoding error of the subordinate station or the limitation of the system configuration information or the parameter scheduling period. The parameter may eventually affect its normal data interaction with the control station; in addition, the update of the system configuration information or parameters may occur during the sleep window of one or more subordinate stations in Sleep mode, at this time, The subordinate station cannot update the system configuration information or parameters, and finally the subordinate station will not be able to obtain the latest system configuration information or parameters as soon as possible in the next Listening window, which may also affect the normality of the subordinate stations. jobs.

Summary of the invention

The technical problem to be solved by the present invention is to provide a communication system and a method for updating system configuration information in a communication system, which are used to solve the problem in the prior art that the subordinate station cannot receive and apply the changed system configuration information in time. The problem that the station is not working properly. In order to solve the above problems, the present invention provides an update method for system information in a communication system, which includes:

The control station adjusts the transmission parameters or transmission methods of the system information;

The control station transmits the system information to one or more subordinate stations in accordance with the adjusted transmission parameters or transmission methods. The step of adjusting, by the control station, the sending parameter or the sending manner of the system information includes:

The control station uses an active adjustment manner to adjust the transmission parameters of the changed system information after determining that the system information has changed. The above methods also include:

The control station determines whether there is one or more subordinate stations in the sleep window in the sleep mode when the system information changes, and determines the duration of the active adjustment mode;

The active adjustment mode adopted by the control station includes: adjusting a scheduling period or a transmission frequency, and/or a coding rate of the system information during a listening window or a listening window of the one or more subordinate stations. The step of adjusting, by the control station, the sending parameter or the sending manner of the system information includes:

The control station uses a passive adjustment manner to adjust the transmission parameters or transmission manners of the changed or all system information according to the feedback information from the subordinate stations;

The feedback information includes: channel quality indication information and/or indication information that the system information update failed. The feedback information is indication information that the system information update fails;

The method further includes: the subordinate station fails to correctly decode the changed system configuration information or parameters, or the subordinate station finds that the system information changes after waking up from the sleep window, and returns the system information update failure to the control station. Indication information;

The step of adjusting, by the control station, the transmission parameter or the transmission mode of the changed or all system information according to the feedback information from the subordinate station by using the passive adjustment method comprises: the control station according to the correctly received subordinate station The feedback update failure indication information, the scheduling period or the transmission frequency, and/or the encoding rate of the system information is adjusted; or the transmission mode is adjusted to send a unicast or broadcast message including the changed system information. The step of the subordinate station feeding back the indication information that the system information update fails to the control station includes:

The subordinate station feeds back the update failure indication information to the control station through the shared uplink physical control channel, and/or the medium access control message;

The update failure indication information includes system configuration information or parameters, and/or subordinate station information. The feedback information is channel quality indicator (CQI) information;

The method further includes: the subordinate station reporting the CQI information in a time interval to the control station by using a long-term or short-term feedback message according to the feedback requirement of the control station;

The control station uses a passive adjustment manner to adjust the transmission parameters or the transmission manner of the changed or all system information according to the feedback information from the subordinate station, including: the control station collects the plurality of times during the time interval. CQI feedback information of different subordinate stations, and then calculating according to the CQI feedback information, and looking up the table to output the scheduling period or transmission frequency, and/or coding rate of the system configuration information or parameters at this time;

The step of the control station transmitting the system information to one or more subordinate stations according to the adjusted transmission parameter or transmission manner includes: the control station subordinate to the station according to an output scheduling period or a transmission frequency, and/or a coding rate. Send subsequent system configuration information or parameters.

The control station performs calculation according to the CQI feedback information of the subordinate station, and looks up the table to output the scheduling period or the transmission frequency of the system configuration information or parameters at this time, and/or the encoding rate includes:

The control station acquires the number of feedbacks (n) of the subordinate station in a specific time interval and the corresponding CQI feedback index (/), and obtains an average CQI feedback cable of the subordinate station in the time interval.

^ 1 ( IdXdvr ),

Get subordinate stations each m average CQI feedback index within a specific time interval _{_{(Idx avrl, Idx avr2, ......}} , Idx avm), and all of its subordinate standing to give an average CQI feedback index UDX _avr within the time interval, ; as well as

The control station uses the average CQI feedback index (IDX _avr ) of the rounding operation to perform a table lookup operation according to a specific mapping table, and outputs a long-term scheduling period or transmission frequency of the system information, and/or a coding rate.

The transmission parameters include: a scheduling period or a transmission frequency, and/or an encoding rate.

The system information includes: system configuration information or parameters for network re-entry, network initial entry, and network discovery.

The control station includes one or more of the following network elements: a macro control station, a micro control station, a pico control station, and a relay station;

The subordinate station includes one or more of the following network elements: terminal, relay station, micro control station, pico Control station. The invention also provides a communication system comprising:

a control station, configured to: adjust a transmission parameter or a transmission mode of the system information; send the system information to one or more subordinate stations according to the adjusted transmission parameter or transmission manner; and the subordinate station, the setting is: receiving And interpret system information.

The subordinate station is further configured to: when the system configuration information or parameters that are changed cannot be correctly decoded, or the subordinate station finds that the system configuration information or the parameter changes after waking up from the sleep window, the system configuration is fed back to the control station. Indication information for failure of information or parameter update;

The control station is configured to adjust the transmission parameter or the transmission mode of the system information in the following manner: 被动 Using the passive adjustment mode, adjusting the scheduling of the system information according to the correctly received indication information of the update failure reported by the subordinate station The period or transmission frequency, and/or the coding rate; or, the transmission mode is adjusted to transmit a unicast or broadcast message containing the changed system information.

The subordinate station is further configured to: report the channel quality indication (CQI) information in a time interval to the control station 4 by using a long-term or short-term feedback message according to the feedback request of the control station;

The control station is configured to: collect passive CQI feedback information from a plurality of different subordinate stations during the time interval, calculate and check the system configuration information according to the CQI feedback information or The scheduling period or transmission frequency of the parameter, and/or the encoding rate; the subsequent system configuration information or parameters are transmitted to the subordinate station according to the output scheduling period or transmission frequency, and/or the encoding rate. The invention also provides a control station in a communication system, comprising:

The adjustment module is configured to: adjust a transmission parameter or a transmission method of the system information; and

And a sending module, configured to: send the system information to one or more subordinate stations according to the adjusted sending parameter or sending manner. The adjusting module is configured to: after determining that the system information is changed, adjust the sending parameter of the changed system information; or send the parameter or send the changed or all system information according to the feedback information of the subordinate station. The way to adjust. With the above at least one aspect of the present invention, the control station adjusts the scheduling period or transmission of the system configuration information or parameters during the update of the system configuration information or parameters in the wireless network, or during the Listening window of one or more of the subordinate stations. The frequency, and/or the coding rate, enables the subordinate station to acquire or apply the latest system configuration information or parameters as soon as possible, thereby solving the system configuration in the prior art that the subordinate station cannot receive the change in time. The problem that the subordinate station cannot work normally due to the information or parameters ensures the normal operation of the subordinate station in the wake-up or sleep mode under the condition that the system configuration information or parameters are changed, and the system performance is improved.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention will be realized and attained by the <RTI BRIEF abstract

The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention.

1 is a flow chart showing a manner of updating first system configuration information or parameters according to an embodiment of the present invention;

2 is a schematic diagram of an update process of the first system configuration information or parameters by using an 802.16m system as an example;

3 is a flow chart showing a manner of updating second system configuration information or parameters according to an embodiment of the present invention;

4 is a flow chart showing a manner of updating a third system configuration information or parameter according to an embodiment of the present invention;

Figure 5 is a flow chart of an algorithm for determining an optimum transmission frequency or scheduling period, and/or encoding rate based on CQI in a third update mode according to an embodiment of the present invention.

Preferred embodiment of the invention In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings.

In the prior art, because the subordinate station decodes the error or is in the sleep mode, or because the system configuration information or the parameter scheduling period is limited, the subordinate station cannot receive and apply the changed system configuration information or parameters in time, thereby causing the subordinate station to The problem that the system does not work normally, the embodiment of the present invention provides a communication system and a method for updating system configuration information or parameters in the communication system.

In the present invention, when the control station determines that it needs to change its system configuration information or parameters, the control station automatically increases the transmission frequency of the corresponding system configuration information or parameters, or reduces the scheduling period of the corresponding system configuration information or parameters; or the subordinate station cannot When the system configuration information or parameters are correctly decoded, the system configuration information or the parameter update failure indication information is fed back to the control station, and the control station adjusts the system configuration information or the parameter transmission frequency or scheduling period, and/or the coding rate, or adjusts the system. The configuration information or the manner in which the parameters are transmitted; or the control station adjusts the scheduling period or transmission frequency, and/or the encoding rate of the system configuration information or parameters based on long-term or short-term CQI feedback from a plurality of subordinate stations.

The method for updating system information in a communication system of the present invention comprises the following steps:

The control station uses the method of active adjustment to determine the transmission parameters of the changed system information after the system information is changed; or the passive adjustment method, based on the feedback information of the subordinate stations, the changed or all systems The sending parameters or sending methods of the information are adjusted;

The control station transmits the changed or all system information to the subordinate station according to the adjusted transmission parameters or transmission method.

The sending parameter includes: a scheduling period or a sending frequency, and/or a coding rate.

The system information includes system configuration information or parameters, such as network re-entry, network initial entry, and network discovery, and other necessary system configuration parameters.

The communication system of the present invention includes:

The control station is configured to adjust the transmission parameters of the changed system information after determining that the system information has changed; or use the passive adjustment method to change the information according to the subordinate station feedback information. Or adjust the sending parameters or sending methods of all system information; The changed or all system information is sent to the subordinate station according to the adjusted transmission parameter or transmission method.

Subordinate station, used to receive and interpret system information.

Further, the subordinate station is further configured to feed back the system to the control station if the system configuration information or parameters are changed after the subordinate station wakes up from the Sleep window under the condition that the changed system configuration information or parameters cannot be correctly decoded. Instructions for configuration information or parameter update failure. Correspondingly, the control station adjusts a scheduling period or a sending frequency, and/or a coding rate of the system information according to the correctly received indication information of the update failure reported by the subordinate station; or, the subordinate station sends the changed content including Unicast or broadcast messages of system information.

Further, the subordinate station is further configured to report channel quality indication (CQI) information in a certain time interval to the control station by using a long-term or short-term feedback message according to the feedback requirement of the control station. Correspondingly, the control station is further configured to collect CQI feedback information from a plurality of different subordinate stations in the certain time interval, and perform calculation according to the CQI feedback information, and check and output the scheduling of the system configuration information or parameters at this time. Period or transmission frequency, and/or coding rate; the control station transmits system configuration information or parameters to the subordinate station according to the output scheduling period or transmission frequency, and/or the coding rate.

The control station of the present invention includes:

The adjustment module is configured to adjust a sending parameter or a sending manner of the system information;

And a sending module, configured to send the system information to one or more subordinate stations according to the adjusted sending parameter or sending manner.

The adjusting module adjusts the sending parameter of the changed system information after determining that the system information is changed; or performs the sending parameter or the sending mode of the changed or all system information according to the feedback information of the subordinate station. Adjustment.

The method for updating system information of the present invention can be classified into three update modes according to the difference in the adjustment methods.

The first update method:

The control station adjusts the sending parameters of the system information by using the first update manner, including: In the first case, during the update of the system configuration information or parameters on the network side, the control station uses an active adjustment manner to adjust the scheduling period or the transmission frequency, and/or the coding rate of the system configuration information or parameters;

The system configuration information or the update period of the parameter refers to a time range controlled by one or more timers in the control station; wherein the time range refers to a time from when the system configuration information or the parameter changes The time it takes for the latest system configuration information or parameters to be applied to the system.

In the second case, when the network side system configuration information or parameters change, and one or more subordinate stations in the network are in the Sleep window, the control station uses the active adjustment mode, in the next one or more The scheduling period or transmission frequency, and/or encoding rate of the system configuration information or parameters are adjusted during the listening window of the subordinate station or outside the listening window.

Further, the foregoing control station adjusts a scheduling period or a sending frequency, and/or a coding rate of the system configuration information or parameters, including:

Increasing the frequency of sending system configuration information or parameters, or reducing the scheduling period of system configuration information or parameters; wherein the system configuration information or parameters refer to system configuration information or parameters that are currently changing.

Second update method

If the subordinate station fails to correctly decode the changed system configuration information or parameters, or the subordinate station wakes up from the sleep window and finds that the system configuration information or parameters change, the system configuration information or parameter update failure is reported to the control station. Instructions;

When the control station correctly receives the feedback indication information from the subordinate station, the control station can increase the transmission frequency of the corresponding system configuration information or parameters, or reduce the scheduling period of the corresponding system configuration information or parameters, or send the change to the subordinate station. The system configuration information or the unicast or broadcast message of the parameter, or perform other related operations to notify the subordinate station of the changed system configuration information or parameters.

The update failure indication information fed back by the subordinate station to the control station may include: system configuration information or parameters, and/or subordinate station information. After the subordinate station wakes up from the sleep window, if the system configuration information or the parameter is changed, the update failure indication information may be fed back to the control station in the listening window.

The update failure indication information that the subordinate station feeds back to the control station to the system configuration information or parameters includes one or a combination of at least two of the following:

The subordinate station can feed back to the control station through a shared uplink physical control channel (such as a codeword reserved in the Ranging channel); or,

Subordinate stations can feed back to the control station via Media Access Control (MAC) messages.

The third update method

Step 1: The subordinate station reports the channel quality indication (CQI) information in a certain time interval to the control station according to the feedback request of the control station through the long-term or short-term feedback message;

Step 2: The control station collects CQI feedback information from a plurality of different subordinate stations during the certain time interval, and combines the CQI feedback information as an input of an algorithm module;

Step 3: The algorithm module outputs the optimal system configuration information or the scheduling period or the sending frequency, and/or the encoding rate of the parameter at this time.

Step 4: The control station adjusts the scheduling period or the sending frequency of the system configuration information or parameters, and/or the encoding rate, and sends the system configuration information to the subordinate station according to the scheduling period or the sending frequency output by the algorithm module, and/or the encoding rate. parameter.

The scheduling period or the sending frequency, and/or the encoding rate of the system configuration information or parameters are adjusted by the control station, including: increasing or decreasing a scheduling period or a sending frequency, and/or a coding rate of the system configuration information or parameters.

The coding rate refers to the product of the original coding rate and the number of repetitions; increasing or decreasing the coding rate of the system configuration information or parameters includes: increasing or decreasing the original coding rate and/or repetition of the system configuration information or parameters. frequency.

The system configuration information or parameters include: network re-entry, network initial entry, network discovery, and other necessary system configuration parameters.

In the above three update modes, the control station can increase the corresponding system configuration information or parameter transmission. Send the frequency, or reduce the scheduling period of the corresponding system configuration information or parameters, or send a unicast or broadcast message containing the latest system configuration information or parameters to the subordinate station, which can ensure the subordinate station in the awake mode to configure the system configuration information. Or receiving the system update message or signaling from the control station multiple times before the parameter takes effect, thereby increasing the probability that the subordinate station successfully acquires the changed system configuration information or parameters; meanwhile, it can ensure that the subordinate station in the Sleep mode is in its position Obtain and apply the latest system configuration information or parameters as quickly as possible within the listening interval.

The embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The preferred embodiments of the present invention are described with reference to the accompanying drawings, which are intended to illustrate and illustrate the invention.

The above three update modes are described in detail below with reference to the accompanying drawings.

Embodiment 1

The control station adjusts the scheduling period or the sending frequency of the corresponding system configuration information or parameters in two cases. FIG. 1 is a flowchart of the first system configuration information or the parameter updating manner according to the embodiment of the present invention. As shown in FIG. 1, the method for updating system configuration information or parameters according to an embodiment of the present invention mainly includes the following steps:

Step S101: Based on a certain strategy, the control station determines to change some or all of the system configuration information or parameters, and simultaneously determines a specific time interval (Γ);

Step S102: The control station determines all the subordinate stations in the sleep window at this time in the sleep mode, and simultaneously calculates the time (7) that each subordinate station (z) needs to elapse from the current time until the start of its listening window;

Step S103: The control station selects the maximum time interval (Tmax) among all the time intervals (7;) described above;

Step S104: The control station increases the transmission frequency of the changed system configuration information or parameters in a specific time interval;

Step S105: After the above time interval (T+T^J, the control station reduces the transmission frequency of the system configuration information or parameters, and restores to the original transmission frequency.

Referring to the update mode of this embodiment, the scheduling period may also be adjusted, or the transmission frequency and the adjustment may be adjusted. Code rate, or adjust the scheduling period and encoding rate.

Embodiment 2

In the specific implementation process, the system configuration information or parameter update of 802.16m is taken as an example, as shown in FIG. 2, and the specific implementation process of the first update mode is further explained.

4: In the auxiliary superframe header (S-SFH): the initial scheduling period of subpacket 1 (SP1) is 2 superframes; the initial scheduling period of subpacket 2 (SP2) is 4 superframes; subpacket 3 The initial scheduling period of (SP3) is 4 superframes. In addition, the subordinate station 1 and the subordinate station 2 currently operate in the Sleep mode.

Specifically, the update process of the system configuration information or parameters includes the following steps:

Step 201: The control station determines that the system configuration information or parameters in the sub-packet 2, sub-packet 3 needs to be changed in the nth superframe, and the specific time interval is determined as .

Specifically, the control station can change any one or two sub-packets of sub-package 1, sub-package 2, and sub-packet 3 as needed, or change the three sub-packets at the same time.

Specifically, the time interval Γ refers to the time elapsed from the change of system configuration information or parameters determined by the control station to the final application to the system.

Step 202: The control station determines that the subordinate station in the sleep window at the time of the Sleep mode is the subordinate station 1 and the subordinate station 2, and the subordinate station 1 starts from the nth superframe and needs to go through a super super until the listening window is started. The frame (T!), and the subordinate station 2 starts from the nth superframe and needs to go through 2 superframes (T ₂ ) until its listening window is started.

Specifically, at the start time of the nth superframe, there may not be any subordinate stations in the Sleep window in the Sleep mode, in which case step 202 may be skipped directly; or there are three or more in the sleep window. Subordinate station.

Specifically, the time that the subordinate station needs to elapse from the start time of the nth superframe until the start of its listening window may not be an integer number of superframes (1 superframe includes 4 radio frames), but an integer number of radio frames. Therefore, the unit of the time interval may be a superframe or a radio frame.

Step 203: The control station selects the maximum time interval (T ₂ ) among the time intervals (7^ and 7^) corresponding to the subordinate station 1 and the subordinate station 2 obtained from step 202. Step 204: The control station increases the transmission frequency of the changed system configuration information or parameters (the sub-packet 2 and the sub-packet 3) within a time interval of seven 802.16m super frames (that is, 28 radio frames); specifically The instantaneous scheduling period of sub-packet 1 is the same as the initial scheduling period, and the instantaneous scheduling periods of sub-packets 2 and sub-packets 3 are all changed to 2 superframes.

Step 205: After the time interval determined from step 204 (from the nth superframe to the n+6th superframe), the control station reduces the transmission frequency of the sub-packet 2 and the sub-packet 3; specifically, the sub-packet 2 and the sub-packet The scheduling period of 3 is all restored to the initial 4 superframes.

Embodiment 3

In this embodiment, if the subordinate station fails to correctly decode the changed system configuration information or parameters, or the subordinate station wakes up from the sleep window and finds that the system configuration information or the parameter changes, the system configuration is fed back to the control station. Indication information for failure of information or parameter update;

When the control station correctly receives the feedback indication information from the subordinate station, the control station can increase the transmission frequency of the corresponding system configuration information or parameters, or reduce the scheduling period of the corresponding system configuration information or parameters, or send the latest information to the subordinate station. A unicast or broadcast message of system configuration information or parameters, or perform other related operations.

FIG. 3 is a flow chart of a method for updating the second system configuration information or parameters according to an embodiment of the present invention; the method for updating system configuration information or parameters according to an embodiment of the present invention mainly includes the following steps:

Step S301: The subordinate station determines that it cannot correctly decode the changed system configuration information or parameters, or the subordinate station finds that the system configuration information or the parameter changes after waking up from the sleep window; Step S302: The subordinate station passes the shared uplink physical control channel Or the MAC message feeds back to the control station the information that the system configuration information or the parameter update fails;

Step S303: The control station increases the transmission frequency of the changed system configuration information or parameters, or reduces the scheduling period of the corresponding system configuration information or parameters, or sends a unicast or broadcast containing the latest system configuration information or parameters to the subordinate station. Message, or perform other related operations.

In a specific implementation process, the subordinate station can determine when the system configuration information or parameters change or whether the current change occurs by using an explicit indication message or control signaling from the control station. Specifically, when the system configuration information or the parameter changes, if the subordinate station does not correctly solve the system configuration information or parameters, such as a cyclic redundancy check (CRC) error, the subordinate station will feed back the system to the control station. Instructions for configuration information or parameter update failure.

Specifically, the subordinate station feeds back to the control station the indication information of the system configuration information or the parameter update failure by using the shared uplink physical control channel, including all the subordinate stations transmitting the indication information by using the same fixed physical time-frequency resource, and The indication information may carry one or more indication sequences.

Specifically, the subordinate station feeds back to the control station the indication information of the system configuration information or the parameter update failure by using a MAC message, including that all the subordinate stations can use the unicast MAC message above the data or the service channel to send the indication information, An example of an information field included in the MAC message is as shown in Table 1.

For the 802.16m system, the information field "system configuration information or parameter information of the update failure" may include specific S-SFH sub-packet update failure information, for example, using a bitmap of 3 bits to indicate which one of the three sub-packets or Which sub-packets update failed, even if the first bit corresponds to sub-packet 1, the second bit corresponds to sub-packet 2, and the third bit corresponds to sub-packet 3.

Table 1 Example of MAC message information field for system configuration information or parameter update failure indication

Specifically, when the control station correctly receives the feedback indication information from the subordinate station, the control station may increase the transmission frequency of the system configuration information or parameters carried in the broadcast physical control channel within a specific time interval, or Lowering the scheduling period of the system configuration information or parameters, and then restoring the initial system configuration information or the transmission frequency or scheduling period of the parameters; or transmitting the unicast or the latest system configuration information or parameters to the subordinate station through the data or traffic channel Broadcast message.

Embodiment 4 In this embodiment, the control station adjusts the scheduling period or transmission frequency, and/or encoding rate of the system configuration information or parameters based on CQI feedback from the subordinate stations. FIG. 4 is a flowchart of a third system configuration information or a parameter update manner according to an embodiment of the present invention, as shown in FIG. 4; the method for updating system configuration information or parameters according to an embodiment of the present invention mainly includes the following steps. :

Step S401: Based on the feedback request from the control station, the subordinate station reports the channel quality indication (CQI) information in a certain time interval to the control station through long-term or short-term feedback;

Step S402: The control station collects CQI feedback information from a plurality of different subordinate stations within a certain time interval, and combines the information as an input of an algorithm module;

Step S403: The algorithm module outputs a long-term scheduling period or transmission frequency, and/or a coding rate of the optimal system configuration information or parameters at this time;

Step S404: The control station sends the system information to the subordinate station according to the scheduling period or the sending frequency output by the algorithm module, and/or the encoding rate.

In a specific implementation process, the control station may use CQI feedback information from some or all of the subordinate stations in the network to operate; specifically, when the control station indicates or under default conditions, all subordinate stations need to feed back CQI information to the control station. When the control station uses the feedback information from all the subordinate stations to perform system configuration information or parameter update operation; when the control station indicates that part of the subordinate station needs to feed back CQI information to the control station, the control station uses feedback information from the part of the subordinate stations Perform system configuration information or parameter update operations.

Specifically, all subordinate stations capable of performing CQI feedback operations may have the same or different long-term or short-term feedback periods (ie, feedback time intervals), such as four or eight radio frames, and the feedback period may be lacking. The value is saved, or is explicitly indicated by the control station via downlink control signaling or messages.

Specifically, since different subordinate stations may use different CQI feedback periods, the number of feedbacks received by the control station from different subordinate stations is different in the same time interval. Therefore, firstly, feedback from a single subordinate station needs to be considered. Then consider the average status of all subordinate stations.

As shown in FIG. 5, the manner in which the algorithm module determines a scheduling period or a transmission frequency, and/or a coding rate specifically includes the following steps:

Step S501, the control station actively collects the counter from the specific subordinate station within a specific time interval. Feeding information, obtaining the number of feedbacks (w) of the subordinate station during the period and the corresponding CQI feedback index (Idx).

Specifically, the CQI index of each feedback (IdxJ can carry specific modulation and coding mode information, which is the best modulation coding scheme that the subordinate station should inform the control station in the downlink transmission between them.

Step S502: The control station uses the n CQI feedback indexes of the subordinate stations acquired in step S501 to calculate an average CQI feedback index (Idx _avr ) of the subordinate station in the time interval according to the following formula.

Idx _avr = ( Idx ι +Idx ₂ + +Idx _n ) I n

Step S503, the control station repeatedly performs the above steps S501 and S502 for the next subordinate station that enables the uplink CQI feedback, and finally obtains the average CQI feedback index Udx of each subordinate station that enables the uplink CQI feedback in the time interval. _Avrl , Idx _avr2 , ... , Idx J ; where w represents the number of subordinate stations currently enabled for upstream CQI feedback.

Step S504, the control station uses the average CQI feedback index (Idx _{av )} of each of the subordinate stations that enable the uplink CQI feedback obtained in step S503, and calculates an average CQI feedback index of all the subordinate stations in the time interval according to the following formula. _Avr,:

IDXavr = ( Idx _avrl +Idx _avr2 + + Idx _a ) I m

Preferably, according to different implementations, the above average CQI feedback index IDX _{avr may} be rounded up, rounded down or rounded within a certain range of values (such as 1 to 16).

Step S505, the control station uses the average CQI feedback index (IDX _avr ) of the rounding operation acquired in step S504 to perform a table lookup operation according to a specific mapping table, and finally outputs an optimal system configuration information or a long-term scheduling period of parameters. Or send frequency, and / or encoding rate.

Specifically, for different radio frequency interface technologies, the mapping between the average CQI feedback index UDX _avr , the scheduling period or the sending frequency of the corresponding system configuration information or parameters, and/or the encoding rate may be different; to 802.16m As an example of the radio interface technology, the mapping table can be as shown in Table 2. Among them, TBD is determined by later, and is an abbreviation of To Be Determined. Table 2 - Mapping relationship between 802.16m average CQI feedback index UDX _avr , scheduling period and coding rate of corresponding system configuration information or parameters (S-SFH)

Specifically, the control station adjusts a scheduling period or a sending frequency, and/or a coding rate of the system configuration information or parameters, and according to the foregoing steps S501 to S505, includes adding or decreasing a scheduling period or sending of the system configuration information or parameters. Frequency, and / or coding rate.

Specifically, the coding rate refers to a product of an original coding rate and a repetition number; increasing or decreasing Low coding rate of the system configuration information or parameters includes increasing or decreasing the original coding rate and/or number of repetitions of the system configuration information or parameters.

While the preferred embodiments of the present invention have been disclosed for purposes of illustration, those skilled in the art will recognize that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.

One of ordinary skill in the art will appreciate that all or a portion of the steps above may be accomplished by a program to instruct the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial applicability

With the solution of the present invention, the control station adjusts the scheduling of the system configuration information or parameters during the update of system configuration information or parameters in the wireless network, or during the listening window of one or more subordinate stations or outside the listening window. The period or the transmission frequency, and/or the coding rate, enables the subordinate station to acquire or apply the latest system configuration information or parameters as soon as possible, thereby solving the problem in the prior art that the subordinate station cannot receive and apply the change in time. After the system configuration information or parameters cause the subordinate station to be unable to work normally, the subordinate station in the wake-up or sleep mode ensures the normal operation under the condition that the system configuration information or parameters are changed, and the system performance is improved.

Claims

Claim

1. An update method for system information in a communication system, comprising:

The control station transmits the system information to one or more subordinate stations in accordance with the adjusted transmission parameters or transmission methods.

2. The updating method according to claim 1, wherein the step of adjusting the transmission parameter or the transmission mode of the system information by the control station comprises:

The control station uses an active adjustment method to adjust the transmission parameters of the changed system information after determining that the system information has changed.

3. The updating method of claim 2, the method further comprising:

The active adjustment mode adopted by the control station includes: adjusting a scheduling period or a transmission frequency, and/or a coding rate of the system information during a listening window or a listening window of the one or more subordinate stations.

4. The updating method according to claim 1, wherein the step of adjusting the transmission parameter or the transmission mode of the system information by the control station comprises:

The feedback information includes: channel quality indication information and/or indication information that the system information update failed.

The update method of claim 4, wherein the feedback information is indication information that the system information update fails;

The method further includes: the subordinate station cannot correctly decode the changed system configuration information or the parameter Under the condition of the number, or the subordinate station finds that the system information changes after waking up from the sleep window, and returns the indication information that the system information update fails to the control station;

The step of adjusting, by the control station, the transmission parameter or the transmission mode of the changed or all system information according to the feedback information from the subordinate station by using the passive adjustment method comprises: the control station according to the correctly received subordinate station The feedback update failure indication information, the scheduling period or the transmission frequency, and/or the encoding rate of the system information is adjusted; or the transmission mode is adjusted to send a unicast or broadcast message including the changed system information.

The updating method according to claim 5, wherein the step of the subordinate station feeding back the indication information of the system information update failure to the control station comprises:

The update failure indication information includes system configuration information or parameters, and/or subordinate station information.

7. The updating method according to claim 4, wherein the feedback information is channel quality indication (CQI) information;

8. The updating method according to claim 7, wherein

The control station performs calculation according to the CQI feedback information of the subordinate station, and looks up the table to output the scheduling period or the transmission frequency of the system configuration information or parameters at this time, and/or the encoding rate includes: The control station acquires the number of feedbacks (n) of the subordinate station in a specific time interval and the corresponding CQI feedback index (/), and obtains an average CQI feedback cable of the subordinate station in the time interval.

^ 1 ( IdXdvr ) ,

The updating method according to any one of claims 1, 2 or 4, wherein

The subordinate station includes one or more of the following network elements: a terminal, a relay station, a micro control station, and a pico control station.

12. A communication system comprising:

13. The communication system according to claim 12, wherein

The subordinate station is also set to: system configuration information or parameters that cannot be correctly decoded and changed If the system configuration information or the parameter is changed after the subordinate station wakes up from the sleep window, the system configuration information or the parameter update failure indication information is fed back to the control station;

14. The communication system according to claim 12, wherein

The control station is configured to: collect passive CQI feedback information from a plurality of different subordinate stations during the time interval, calculate and check the system configuration information according to the CQI feedback information or The scheduling period or transmission frequency of the parameter, and/or the encoding rate; the subsequent system configuration information or parameters are transmitted to the subordinate station according to the output scheduling period or transmission frequency, and/or the encoding rate.

15. A control station in a communication system, comprising:

And a sending module, configured to: send the system information to one or more subordinate stations according to the adjusted sending parameter or sending manner.

The control station according to claim 15, wherein the adjustment module is configured to: after determining that the system information is changed, adjusting the transmission parameter of the changed system information; or according to the feedback information of the subordinate station, Adjust the transmission parameters or transmission method of the changed or all system information.