Antenna selection method and device for mobile terminal

A mobile terminal antenna and mobile terminal technology, applied in the field of mobile communication, to achieve the effects of enhancing transmission performance, avoiding long-term fading, and reducing costs

Inactive Publication Date: 2011-01-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

How to select the antenna is not clearly specif

Method used

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  • Antenna selection method and device for mobile terminal
  • Antenna selection method and device for mobile terminal
  • Antenna selection method and device for mobile terminal

Examples

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Embodiment 1

[0054] In this embodiment, the UE is in FDD mode. In this embodiment, the antenna selection signaling of LTE release8 is reused to instruct the terminal to select an antenna group with good channel quality for combined transmission, as shown in figure 2 As shown, the specific steps are as follows:

[0055] Step 201, grouping UE uplink transmit antennas;

[0056] Grouping antennas may be based on a certain set principle, for example, based on antenna correlation, based on capacity, and so on. In this embodiment, the principle of antenna correlation is adopted to group the uplink antennas of the UE, and two antennas with less correlation are selected as a group, and there are two groups in total. The grouping in this embodiment is a fixed grouping, and in each subframe , the two antennas of a group always transmit and receive signals as a whole.

[0057] Step 202, based on the antenna grouping, send the uplink reference measurement signal to the eNodeB in units of antenna gro...

Embodiment 2

[0065] In this embodiment, in the FDD mode, antenna selection is realized by adding new downlink control information (Downlink Control Information, DCI), that is, adding antenna selection indication information in 6 states, such as Figure 4 As shown, the specific process is as follows:

[0066] Step 401, group the uplink transmit antennas of the UE;

[0067] In this embodiment, a non-fixed grouping method is adopted, and which two antennas are specifically selected for transmission is indicated through newly added antenna selection indication information of 6 states.

[0068] Step 402, sending the uplink reference measurement signal on the four antennas of the two antenna groups in each subframe;

[0069] Step 403: In each subframe, the eNodeB estimates the uplink channel quality according to the received uplink reference measurement signal; sorts the four antennas according to the estimation result;

[0070] Step 404, the eNodeB comprehensively judges which two antennas ha...

Embodiment 3

[0077] In the TDD mode UE's autonomous antenna selection process based on reciprocity, such as Figure 7 Shown:

[0078] Step 701, the eNodeB sends a downlink reference measurement signal to the UE, and the UE receives the downlink reference measurement signal;

[0079] Step 702, the UE estimates the quality of the downlink channel by using the channel reciprocity characteristic of the TDD system, and then infers the quality of the uplink channel;

[0080] Step 703, the UE autonomously decides to select an antenna group with better uplink channel quality for transmission.

[0081] For the TDD system, if the UE cannot utilize channel reciprocity in certain scenarios (such as a Doppler frequency shift environment), the uplink channel measurement can be implemented in a manner similar to FDD. One option is to treat the four uplink antennas as two antenna groups. For this antenna selection method, the antenna signaling notification method of LTE release8 can be reused, so that t...

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Abstract

The invention discloses an antenna selection method and an antenna selection system for a mobile terminal, and is used for solving the technical problem of antenna selection under an LTE-A protocol version. By considering power conservation of the terminal and cost problem, four antennas are grouped or sorted according to channel quality estimation results thereof so as to select a group of antennas or two antennas with the highest channel quality estimation for transmission. The antenna selection method and the antenna selection system can use an antenna selection signaling in an LTE release8 protocol version, have little modification of the system and low signaling overhead, and also can support a flexible antenna grouping mode by increasing DCI so as to improve the sensitivity to the channel quality and enhance transmission performance.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for selecting an antenna of a mobile terminal. Background technique [0002] The Long Term Evolution (LTE for short) system is an important plan of the third generation partnership organization. Orthogonal Frequency Division Multiplexing (OFDM) is one of the core technologies in the fourth generation mobile communication, and it is essentially a multi-carrier modulation communication technology. MIMO (Multi-Input Multi-Output) technology can increase system capacity, improve transmission performance, and can be well integrated with other physical layer technologies, so it has become a key technology for B3G and 4G mobile communication systems. However, when the channel correlation is strong, the diversity gain and multiplexing gain brought by the multipath channel are greatly reduced, resulting in a significant drop in MIMO system performance. [0003] Wh...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08H04B1/707H04W24/10
CPCH04B7/0691Y02D30/70
Inventor 支周于辉魏巍郭阳卢忱
Owner ZTE CORP
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