Communication method, packet radio system, controller and user terminal

A wireless system and user terminal technology, applied in the transmission system, wireless communication, digital transmission system, etc., can solve problems such as violation of HARQ, and achieve the effect of reducing business load

Active Publication Date: 2007-05-23
NOKIA TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such operation requires some additional delay from RNC to Node B, which defeats the purpose of HARQ

Method used

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  • Communication method, packet radio system, controller and user terminal
  • Communication method, packet radio system, controller and user terminal
  • Communication method, packet radio system, controller and user terminal

Examples

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Embodiment Construction

[0020] Referring to Figure 1, let us examine an example of a packet radio system to which the preferred embodiment of the present invention can be applied. The packet radio system in Fig. 1, known at least as UMTS (Universal Mobile Telecommunications System) and IMT-2000 (International Mobile Telecommunications 2000), represents a third generation radio system. However, this embodiment is not limited to the systems described as examples, and those skilled in the art may also apply the instructions to other wireless systems containing corresponding features.

[0021] Figure 1 is a simplified block diagram showing the most important parts of a packet radio system and their interfaces at the network element level. The structure and function of the network elements will not be described in detail as they are well known.

[0022] The main parts of a packet radio system are a core network (CN) 100 , a radio access network 130 and user terminals (UE) 170 . The term UTRAN is an acro...

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Abstract

A communication method, a packet radio system, a controller and a user terminal. The packet radio system includes a controller (146), a user terminal (170) and more than one base stations (142, 144) communicating with the controller and a user terminal of the packet radio system. A processing unit (226) of the controller is further configured to define a subset of an active set of soft handover on the basis of performances of base stations in the active set, and to provide information on which base stations are included in the defined subset, and the processing unit (220) of the user terminal is further configured to monitor HARQ information only from the base stations that are included in the defined subset.

Description

technical field [0001] The present invention relates to a communication method in a packet radio system, a packet radio system, a controller of the packet radio system, and a user terminal of the packet radio system. Background technique [0002] There are different HARQ (Hybrid Automatic Repeat Request) methods in the case of soft handover (handover). In one possible scheme, each Node B in the active set for soft handover receives data from the user terminal and sends ACK / NACK (acknowledgement / negative acknowledgment) down to the user terminal. A retransmission occurs if the user terminal does not receive an ACK from any Node B in the active set for soft handover. If at least one ACK is received, new data is transmitted instead. With macro diversity gain and chase combining, this scheme already provides good performance when ACK / NACK signaling is error-free. [0003] The soft handover decision is based on the measurement of the DL CPICH (Downlink Common Pilot Channel) ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L12/56H04LH04L1/18H04W28/04H04W36/18
CPCH04W36/18H04L1/1812H04L1/1887H04W28/04H04W36/00692H04W36/185
Inventor 徐兆吉
Owner NOKIA TECH OY
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