Communication control method, radio communication system, base station, and mobile station

A technology of communication control and radio channel, applied in the field of communication control, radio communication system, base station and mobile station

Inactive Publication Date: 2007-09-19
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this situation, the mobile station recognizes the retransmission state and saves the data, but the base station in the free state does not allocate retransmission resources

Method used

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  • Communication control method, radio communication system, base station, and mobile station
  • Communication control method, radio communication system, base station, and mobile station
  • Communication control method, radio communication system, base station, and mobile station

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0124] The communication control method according to the first embodiment will be described below.

[0125] In the first embodiment, it will be assumed that time / transmission rate scheduling and synchronous transmission for HARQ are used. It is also assumed that at the time of retransmission, the base station will issue an order that the retransmission method controlled by the base station will be used.

[0126] In this embodiment, a configuration is adopted in which TFCI is used to realize the transmission of the HARQ process status of the mobile station. TFCI is a bit sequence indicating the TFC specifying the transmission data format, and two of these bit sequences will be defined as Free Status Notification and Retransmission Status Notification. It is assumed here that a 5-bit TFCI is used, as shown in the table below. In other words, TFCI0 is defined as a free state, and TFCI1 is defined as a retransmission state.

[0127] TFCI classification

bit sequence...

no. 2 example

[0171] The second embodiment assumes the use of time scheduling and asynchronous transmission for HARQ. Furthermore, the mobile station is assumed to make determinations on retransmissions. In other words, it is assumed that a spontaneous retransmission method is used. As in the first embodiment, this second embodiment also uses TFCI to send HARQ process status notifications. More specifically, TFCI0 is defined as a free state. TFCI1 is defined as the retransmission state.

[0172] The mobile station uses HARQ process status notification in the following situations:

[0173] (a) when the mobile station has received the SA and the mobile station has no data in its buffer that should be transmitted;

[0174] (b) when the mobile station has received the SA, and after receiving the NACK, the maximum transmission rate is continuously lower than the transmission rate required for retransmission at intervals of W frames; and

[0175] (c) When the mobile station cannot receive AC...

no. 3 example

[0200] The communication control method of the third embodiment will be described below.

[0201] Like the first embodiment, in the third embodiment, it is assumed that time / transmission rate scheduling is used, and it is assumed that HARQ adopts synchronous transmission. Also, assume that the base station issues an order for retransmission. In other words, it will be assumed that a base station controlled retransmission method is used.

[0202] In a third embodiment, when the mobile station receives a NACK from the scheduling base station and an ACK from another SHO base station, and has no data in its buffer, the mobile station sends a "no data" notification As a HARQ process status notification. TFCI0 is used as a "no data" notification, and upon receiving TFCI0 from the mobile station, the base station corrects the relevant HARQ process to a free state and does not allocate retransmission resources.

[0203] Using the above "no data" notification can avoid meaningless r...

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Abstract

In a radio communication system performing HARQ (hybrid automatic retransmission control), when a mobile station receives ACK, it returns its HARQ processing state to a free state. In this state, when the mobile station receives SA (scheduling assignment) for assigning resources for retransmission from a scheduling base station, the mobile station transmits a transmission process state report reporting that it is in the free state if no new data to be transmitted is present. Thus, the base station recognizes that the mobile station is in the free state and resets its HARQ processing state to the free state and stops resource assignment to the mobile stations.

Description

technical field [0001] The present invention relates to a base station, a mobile station, and a control signal transmission method in a radio communication system such as a cellular system, and more particularly, to retransmission control of packet transmission on the uplink (i.e., the line from the mobile station to the base station) . Background technique [0002] Various communication systems generally have an ARQ (Automatic Repeat Request) function for eliminating the influence of errors occurring in transmission. Automatic repeat request is one of data transmission methods widely used in cable communication systems and radio communication systems, in which data that has been sent by the sender is subjected to error detection at the receiver, and when correct reception is possible, the receiver sends the data to the sender ACK (Acknowledgment) is reported as a delivery authentication signal indicating that correct reception is possible. When the receiver cannot receive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04L1/18H04W16/02H04W28/00H04W28/04H04W72/12
CPCH04L1/1887H04L1/1812H04L1/1829H04L1/1864H04L1/188H04L1/1893H04L1/1896H04L2001/125H04L5/0055H04W72/23
Inventor 黑田奈穗子李琎硕
Owner NEC CORP
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