Feedback method of different long term evaluation-advanced (LTE-A) time division duplex (TDD) uplink and downlink proportion

A physical uplink and line sub-technology, applied in the directions of signaling allocation, transmission path separation device, transmission path sub-channel allocation, etc., can solve the problems of increasing the design complexity of the TDD system, affecting the throughput performance of the TDD system, and reducing the delay effect

Inactive Publication Date: 2013-02-20
POTEVIO INFORMATION TECH
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  • Application Information

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Problems solved by technology

This affects the throughput performance of the TDD system and increases the complexity of the TDD system design

Method used

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  • Feedback method of different long term evaluation-advanced (LTE-A) time division duplex (TDD) uplink and downlink proportion
  • Feedback method of different long term evaluation-advanced (LTE-A) time division duplex (TDD) uplink and downlink proportion
  • Feedback method of different long term evaluation-advanced (LTE-A) time division duplex (TDD) uplink and downlink proportion

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Embodiment Construction

[0032] The Ack / Nack feedback method of different LTE-A TDD uplink and downlink ratios proposed by the present invention includes the following technical features:

[0033] Feature A: For the Ack / Nack feedback when TDD is configured with different uplink and downlink ratios in different frequency bands (need to meet the timing relationship of at least four subframes), two solutions are proposed:

[0034] Option One:

[0035] (1) For the asymmetric uplink and downlink subframes in the carrier aggregation scenario, as shown by the ellipses in Figure 2 (a), (b) and (c), that is, some carriers in this subframe are uplink subframes, and some carriers It is a downlink subframe. The uplink subframe of each component carrier only feeds back the Ack / Nack of the downlink subframe PDSCH of this carrier, and does not feed back the Ack / Nack of other carriers. The timing relationship of the feedback is as defined in Table 2. Correspondence between uplink subframes;

[0036] (2) When uplink ...

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Abstract

The invention provides a feedback method of different long term evaluation-advanced (LTE-A) time division duplex (TDD) uplink and downlink proportions. In prior art, as for asymmetric uplink and downlink subframes in carrier aggregation scenes, an uplink subframe of each member carrier only feeds back acknowledgement character (ACK)/negative acknowledgement (Nack) of physical downlink shared channel (PDSCH) of the downlink subframe of the carrier and doesn't feed back ACK/ Nack of other carriers. According to the feedback method of different LTE-A TDD uplink and downlink proportions, as for asymmetric uplink and downlink subframes in a carrier aggregation scene, ACK/ Nack of the downlink subframe of each member carrier is fed back by an uplink subframe of an auxiliary cell with the minimum index, the uplink subframe is a nearest uplink subframe after at least four subframes, and ACK/ Nack of a plurality of carriers is allowed to be transmitted in other carriers. By means of the characteristic that uplink subframes are asymmetric when subframe proportions are different, the maximum value of the ACK/ Nack of the downlink PDSCH can be reduced, the ACK/ Nack of the downlink PDSCH is fed back in the uplink subframes, and time delay for the ACK/ Nack of the downlink subframe to feed back to an evolved node base (eNB) is reduced.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a feedback method for different ratios of uplink and downlink in LTE-A time division duplex (TDD). Background technique [0002] In LTE-A Release 10 (Rel-10), the concept of carrier aggregation is introduced to support wider bandwidth, that is, two or more carriers are aggregated together to support LTE-A transmission bandwidth greater than 20 MHz. For the time-division duplex (TDD) scenario of carrier aggregation of Rel-10, only the intra-band scenario is supported, and the frequency band (band) is an available wireless spectrum resource determined by the International Telecommunication Union. In this case, if different uplink and downlink ratios are used, serious interference will occur between the uplink and downlink when transmitting and receiving. Therefore, the aggregated carriers must use the same TDD uplink and downlink ratio. Such as figure 1 Shown is a schematic di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
CPCH04L5/1469H04L5/0055H04L5/001H04L1/1861H04L1/18H04L5/14
Inventor 鲁智陈哲池连刚吴联海
Owner POTEVIO INFORMATION TECH
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