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Mobile station, radio access network device, and mobile communication system

A technology for wireless access network and mobile station, which is applied in the direction of wireless communication, electrical components, etc., and can solve problems such as inability to receive uplink signals correctly.

Active Publication Date: 2010-02-17
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When communication is started using the random access preamble in this way, there is a possibility that a plurality of mobile stations select and use the same identifier (Signature). Collision, multiple mobile stations will use the same resource to transmit, in the wireless access network device figure 1 (3) Dedicated channel transmission is simultaneously transmitted from multiple mobile stations using the same uplink radio resource, and the uplink signal cannot be received correctly

Method used

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  • Mobile station, radio access network device, and mobile communication system
  • Mobile station, radio access network device, and mobile communication system
  • Mobile station, radio access network device, and mobile communication system

Examples

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Embodiment Construction

[0053] Next, preferred modes for implementing the present invention will be described based on the following examples with reference to the drawings. In addition, in all the drawings for explaining the embodiment, parts having the same functions are assigned the same reference numerals, and repeated descriptions are omitted.

[0054] In LTE, an embodiment of the present invention will be discussed with respect to the following sequence: when a radio access network device transmits a handover request signal to a mobile station, in order to avoid a collision of identifiers (signatures (Signature)), the radio access network device will The handover request signal is assigned to the mobile station together with a user-specific identifier (signature) to be used when the mobile station connects to the handover target cell. The mobile station that has received the handover request signal transmits a random access preamble to the handover destination cell using the assigned user-speci...

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Abstract

A radio access network device performs communication with a mobile station by using an uplink-occupying channel, a downlink-sharing data channel, and a downlink signaling control channel. The radio access network device includes: uplink-occupying channel allocation means which allocates an uplink-occupying channel to a mobile station which is starting or resuming a communication by using the uplink-occupying channel, on the downlink-sharing data channel; occupied-channel reception detection means which detects a reception of the uplink transmission from the mobile station on the occupied channel which has been allocated; and the downlink transmission means which transmits a response to the mobile station by using the downlink-sharing data channel and the downlink signaling control channelif a reception of the occupied channel of the mobile station is detected.

Description

technical field [0001] The invention relates to a mobile station, a wireless access network device and a mobile communication system. Background technique [0002] In the long term evolution (LTE: Long term evolution) studied in the 3G system, when the mobile station starts or restarts communication with the radio network device eNB, such as figure 1 As shown, the mobile station sends a contention channel signal (random access preamble: Random access preamble) to the wireless access network device to request communication start. Since a plurality of mobile stations can simultaneously transmit random access preambles, the radio network device notifies each mobile station of a plurality of identifiers (signatures) that can be used by each mobile station in advance. The mobile station randomly selects one identifier (Signature) from a plurality of identifiers (Signature) notified in advance, and sends a random access message using the selected identifier (Signature). preamble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04
CPCH04W74/0866H04W72/1268H04W74/006H04W72/042H04W72/04H04W74/0833H04W72/23H04W88/08H04W74/00
Inventor 石井美波安尼尔·乌美什安部田贞行
Owner NTT DOCOMO INC