Scheduling method and device for bundling subframes in LTE (long term evolution) system

Abstract

Disclosed is a scheduling method and device for bundling subframes in an LTE (long term evolution) system. The method includes: initializing a resource allocation range of non-TTI (transmission time interval) bundling users and TTI bundling users; performing non-adaptive HARQ (hybrid automatic repeat request) retransmission scheduling on the last three TTIs in one bundle for newly-transmitted or retransmitted scheduled TTI bundling users; performing non-adaptive HARQ retransmission scheduling on the first TTI in one bundle for the newly-transmitted or retransmitted scheduled TTI bundling users; performing semi-persistent scheduling or dynamic scheduling on SPS (semi-persistent scheduling) users; performing HARQ adaptive or non-adaptive retransmission scheduling on the non-TTI bundling users; performing dynamic new transmission scheduling on the non-TTI bundling users and the TTI bundling users.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a scheduling method and device for ensuring subframe binding in an LTE (Long Term Evolution, long term evolution system) system. Background technique [0002] In the LTE system, the scheduling unit is 1 ms. In general scenarios, the HARQ adaptive or non-adaptive retransmission scheme with HTT (HARQ loopback time, HARQ is hybrid automatic repeat request) equal to 8 ms can guarantee the uplink transmission rate. However, for the edge of the cell, the quality of the user channel deteriorates. Due to the limited uplink transmission power of the user, the reliability of the transmission cannot be improved by increasing the power. If HARQ retransmission processing is used in general scenarios, each retransmission takes 8ms. The retransmission delay, the edge bit error rate is relatively high, and multiple retransmissions are required, which cannot meet the delay-sensitive re...

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Problems solved by technology

[0009] However, for the HARQ retransmission of TTI bundling, since the HTT of the retransmission is 16ms, if the new transmission is performed on subframe N, different redundancy will be transmitted on N+1, N+2, and N+3 consecutive subframes at the same time. In the remaining version, the base station combines and decodes the data of 4 consecutive subframes after receiving the data, and feeds back the PHICH on subframe N+7. If the decoding is wrong, it needs to retransmit on subframe N+16. If it is not adaptive retransmission scheduling If successful, PHICH is fed back as NACK on subframe N+7, and transport block 1 is retransmitted on subframe N+16. If non-adaptive retransmission scheduling fails, adaptive retransmission is performed. If adaptive retransmission succeeds, Then the PHICH is fed back as NACK in subframe N+7, the authorized PDCCH for uplink retransmission is issued in subframe N+12, and transport block 1 is retransmitted in subframe N+16. If the adaptive retransmission also fails, that is In subframe N+12, the scheduling on the base station side fails, and the uplink authorized PDCCH cannot be delivered, and the PHICH is delivered in subframe N+7, because the scheduling on the base station side is based on 1 ms, and it is impossible to determine the N In the scheduling situation at time +12, PHICH and PDCCH are sent at different times, and PHICH must be fed back as NACK at N+7. Therefore, for this scenario where retransmission resource application fails, PHICH cannot send FAKE ACK, resulting in the user receiving a transmission The NACK fed back by block 1 will perform non-adaptive retransmission in subframe N+16, which is inconsistent with the retransmission scheduling failure behavior of the base station, causing decoding errors and interference to other users

Therefore, in the TTI bundling HARQ retransmission sequence, the feedback of PHICH and the uplink grant PDCCH cannot be delivered at the same time, resulting in the failure to feed back PHICH FAKE ACK in the scenario of retransmission resource scheduling failure, which becomes a problem that must be solved in TTI bundling retransmission

[0010] At the same time, there are resource conflicts between TTI bundling retransmission and other scheduling types, such as TTI bundling retransmission and SPS semi-static scheduling resource conflicts, TTI bundling retransmission and non-TTI bundling retransmission resource conflicts, etc., which must be resolved for TTI bundling retransmission The problem

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