CN103533575A - Method for improving transmission performance of relay station in LTE (long term evolution) small base station system - Google Patents
Method for improving transmission performance of relay station in LTE (long term evolution) small base station system Download PDFInfo
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- CN103533575A CN103533575A CN201310503041.8A CN201310503041A CN103533575A CN 103533575 A CN103533575 A CN 103533575A CN 201310503041 A CN201310503041 A CN 201310503041A CN 103533575 A CN103533575 A CN 103533575A
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Abstract
The invention discloses a method for improving transmission performance of a relay station in an LTE small base station system. The method is characterized by comprising the step of configuring TTI bundling in L3RRC signaling of a relay system. In a TD-LTE (time division-long term evolution), an uplink access subframe has low possibility of existence to enable UE (user equipment) to send uplink ACK/NACK (acknowledgement/negative acknowledgement) because of less uplink subframe configuration, and accordingly, sending of downlink data is limited. According to the method, TTI bundling is configured, uplink ACK/NACK is not processed and retransmission is performed directly, so that the speed of the whole cell is guaranteed; TTI bundling is used in a return down link to transmit downlink signals, so that transmission delay is reduced under the poor wireless signal condition; cell coverage can be improved through combination of TTI bundling and Relay; and TTI bundling is configured in L3 signaling, so that repeated demodulation of downlink data by UE can be prevented, and DCI (display control interface) resource occupied by retransmission is saved.
Description
Technical field
The present invention relates to improve the method for relay station transmission performance in the little base station system of LTE.
Background technology
In band, relaying (In-band relaying) is a kind of important trunk type in LTE system.For relaying (In-band relaying) in band, back haul link, access link and the link that direct transfers are all operated on identical frequency spectrum.Generally, for fear of producing between the receiving terminal of relay station self and transmitting terminal, disturb, for relaying in band, on regulation back haul link and access link, can not carry out descending or up transmission simultaneously, and must stagger in time.Therefore, for relay station, relay sub-frame is divided into backhaul subframe and access subframe, and the descending and uplink of the back haul link of relay station is carried out respectively in descending and up backhaul subframe, and access link is descending to carry out respectively with uplink in descending and up access subframe.For descending backhaul subframe, relay station need to carry out the downlink of access link before this subframe on 1 or 2 OFDM symbol, and in remaining available resource, carries out the descending reception of back haul link.TD-LTE system ascending-descending subframes is few, and resource is more nervous.
Summary of the invention
The object of the present invention is to provide a kind of method of improving relay station transmission performance in the little base station system of LTE.
For achieving the above object, technical scheme of the present invention is a kind of method of improving relay station transmission performance in the little base station system of LTE of design, it is characterized in that, in the L3RRC of relay system signaling, configures TTI bundling.
Specifically comprise the steps:.
Source base station DeNodeB, according to current channel quality, as channel condition information (CSI), RLC number of retransmissions etc., configures TTI bundling by field RN-SubframeConfig-r10 in layer three L3 signaling;
DeNodeB is by downlink data of DCI scheduling new biography in R-PDCCH, and the descending backhaul subframe after TTI_BUNDLE_SIZE-1 retransmits; TTI_BUNDLE_SIZE defines in DeNodeB and RN, and the resource of re-transmission is distributed the same with new biography;
Information feedback on PUCCH on the last TTI of bundle for RN.
In TD-LTE system, because sub-frame of uplink configures still less, may not have up access subframe to allow UE send uplink ACK/NACK, limited the transmission of downlink data.The present invention, by configuration TTI-Bundling, does not remove to process up ACK/NACK, directly retransmits, and can reduce like this error rate of transmission, thereby guarantee the speed of whole community.
The present invention uses TTI bundling transmission of downlink signal at backhaul down link, under the poor condition of wireless signal, has reduced transmission delay.TTI bundling and relaying Relay are covered in conjunction with improving community.In L3 signaling, configure TTI bundling and can avoid UE to repeat demodulation downlink data, save and retransmit the DCI resource taking.
Accompanying drawing explanation
Fig. 1 is relay sub-frame configuration schematic diagram;
Fig. 2 is FDD passback downlink relay round trip cycle schematic diagram;
Fig. 3 is R-PDCCH transmitting schematic diagram;
Fig. 4 is the downlink data transmission schematic diagram with TTI bundling.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
The concrete technical scheme of implementing of the present invention is:
The invention provides a kind of method of improving relay station transmission performance in the little base station system of LTE, it is characterized in that, in the L3RRC of relay system signaling, configure TTI bundling.
Specifically comprise the steps:.
Source base station DeNodeB, according to current channel quality, as channel condition information (CSI), RLC number of retransmissions etc., configures TTI bundling by field RN-SubframeConfig-r10 in layer three L3 signaling;
DeNodeB is by downlink data of DCI scheduling new biography in R-PDCCH, and the descending backhaul subframe after TTI_BUNDLE_SIZE-1 retransmits; TTI_BUNDLE_SIZE defines in DeNodeB and RN, and the resource of re-transmission is distributed the same with new biography;
Information feedback on PUCCH on the last TTI of bundle for RN.
In TD-LTE system, because sub-frame of uplink configures still less, may not have up access subframe to allow UE send uplink ACK/NACK, limited the transmission of downlink data.The present invention, by configuration TTI-Bundling, does not remove to process up ACK/NACK, directly retransmits, and can reduce like this error rate of transmission, thereby guarantee the speed of whole community.
The present invention uses TTI bundling transmission of downlink signal at backhaul down link, under the poor condition of wireless signal, has reduced transmission delay.TTI bundling and relaying Relay are covered in conjunction with improving community.In L3 signaling, configure TTI bundling and can avoid UE to repeat demodulation downlink data, save and retransmit the DCI resource taking.
As shown in Figure 1, be relay sub-frame configuration schematic diagram;
As shown in Figure 2, be FDD passback downlink relay round trip cycle schematic diagram;
As shown in Figure 3, be R-PDCCH transmitting schematic diagram;
As shown in Figure 4, be the downlink data transmission schematic diagram with TTI bundling.As scheme UE and decoding and reporting decoded result after receiving 4 re-transmissions.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. in the little base station system of LTE, improve the method for relay station transmission performance, it is characterized in that, in the L3RRC of relay system signaling, configure TTI bundling.
2. the method for improving relay station transmission performance in the little base station system of LTE according to claim 1, is characterized in that, specifically comprises the steps:.
Source base station DeNodeB, according to current channel quality, configures TTI bundl ing by field RN-SubframeConfig-r10 in layer three L3 signaling;
DeNodeB is by downlink data of DCI scheduling new biography in R-PDCCH, and the descending backhaul subframe after TTI_BUNDLE_SIZE-1 retransmits; TTI_BUNDLE_SIZE defines in DeNodeB and RN, and the resource of re-transmission is distributed the same with new biography;
Information feedback on PUCCH on the last TTI of bundle for RN.
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| CN104159319A (en) * | 2014-08-26 | 2014-11-19 | 大唐移动通信设备有限公司 | Method of transmitting competition solution information and base station |
| CN107182081A (en) * | 2016-03-11 | 2017-09-19 | 普天信息技术有限公司 | A kind of scheduling authorization back-off method and device |
| CN107864498A (en) * | 2017-11-13 | 2018-03-30 | 苏州微站通信科技有限公司 | The method that relay station transmission performance is improved in the small base station systems of LTE |
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| CN102754380A (en) * | 2010-02-17 | 2012-10-24 | 高通股份有限公司 | Continuous mode operation for wireless communications systems |
| CN103138903A (en) * | 2011-11-30 | 2013-06-05 | 上海贝尔股份有限公司 | Method and device for transmitting time division-synchronous code division multiple access (TD-SCDMA) long term evolution (TD-LTE) TTI bundling |
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| CN102754380A (en) * | 2010-02-17 | 2012-10-24 | 高通股份有限公司 | Continuous mode operation for wireless communications systems |
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| CN104159319A (en) * | 2014-08-26 | 2014-11-19 | 大唐移动通信设备有限公司 | Method of transmitting competition solution information and base station |
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