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Method and system for implementing HARQ retransmission using unicast link

A unicast and link technology, applied in the field of mobile communication, which can solve the problems that users cannot provide E-MBMS services

Active Publication Date: 2013-12-25
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, E-MBMS service cannot be provided to these users

Method used

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  • Method and system for implementing HARQ retransmission using unicast link
  • Method and system for implementing HARQ retransmission using unicast link
  • Method and system for implementing HARQ retransmission using unicast link

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Embodiment Construction

[0024] The basic idea of ​​the present invention is to use unicast link to assist E-MBMS retransmission. This is feasible for both single-cell and multi-cell based arrangements, but requires that the user terminal be able to receive unicast services in addition to E-MBMS. Specifically, the user terminal selectively utilizes the unicast uplink to report the NACK of the E-MBMS packet to its serving base station. Then, the serving base station selectively uses unicast downlink to retransmit the E-MBMS packet to the user. Finally, the user terminal recovers the E-MBMS packets using techniques such as Maximum Likelihood Combining (MRC).

[0025] In addition, in addition to ACK / NACK reporting for E-MBMS, user terminals can also utilize their unicast uplink to report Channel Quality Indicator (CQI) related information about their E-MBMS channels. According to information such as CQI collected from all user terminals, the system can designate a more appropriate MCS level for E-MBMS ...

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Abstract

A method for implementing hybrid automatic repeat request HARQ retransmission in enhanced multimedia broadcast multicast service E-MBMS using unicast link is disclosed. The method includes the following steps: a user terminal detects the E-MBMS packets transmitted from at least one base station; when the user terminal cannot restore the E-MBMS packets, the user terminal selectively reports a negative acknowledge NACK for the E-MBMS packets to its service base station using unicast uplink; after the service base station receives the negative acknowledge NACK for the E-MBMS packets from the user terminal, the service base station selectively retransmits the E-MBMS packets to the user terminal using unicast downlink.

Description

technical field [0001] The present invention relates to the field of mobile communication, more specifically, the present invention relates to a method, system, User terminals and base stations use unicast links to implement HARQ retransmission of E-MBMS packets, which improves the utilization of radio resources for E-MBMS transmission and is suitable for both single-cell and multi-cell deployments. Background technique [0002] Enhanced Multimedia Broadcast and Multicast Service (E-MBMS) is an important subject of many standardization organizations including 3GPP (Third Generation Partnership Project) LTE (Long Term Evolution) / LTE+ and IEEE 802.16e / m. [0003] For E-MBMS, the base station (BS) serves multiple users at the same time, and different users may experience completely different channel conditions, so it is necessary to choose the modulation and coding scheme (MCS) of E-MBMS packets reasonably to ensure that the Most users provide E-MBMS services. Typically, E-MB...

Claims

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Application Information

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IPC IPC(8): H04L1/18
CPCH04L1/1829H04L2001/0093H04L1/1867
Inventor 朱孝龙杨红卫汪勇刚
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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