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Relay link downlink control information configuration method, transmission base station, relay station and method

A relay link and control information technology, which is applied in the configuration of relay link downlink control information, relay stations, and transmission base stations, to achieve the effect of ensuring flexibility and avoiding influence

Inactive Publication Date: 2011-06-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a relay link downlink control information configuration method, a transmission base station, a relay station and the method, which solves the problem of sending the relay link physical downlink control information

Method used

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  • Relay link downlink control information configuration method, transmission base station, relay station and method
  • Relay link downlink control information configuration method, transmission base station, relay station and method
  • Relay link downlink control information configuration method, transmission base station, relay station and method

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Embodiment 1

[0094]It is generally believed that the channel condition of the relay link is better than that of the direct transmission link, so the transmission of downlink control information on the relay link may reduce resource overhead on the basis of the direct transmission link without causing transmission performance degradation. A general way to reduce the resource overhead is to use a higher-order constellation modulation method, or to increase the code rate of transmission, and so on. The method of changing the code rate is generally accomplished by rate matching (ratematching).

[0095] For example, considering that the channel condition of the relay link is relatively good, high-order modulation is adopted to achieve the purpose of reducing control signaling overhead. In LTE, PDCCH is modulated by quadrature phase shift keying (QPSK); and for R-PDCCH, 16-order quadrature amplitude modulation (16QAM) or even 64QAM modulation can be used. After the modulation order is increase...

Embodiment 2

[0103] For the relay station, the resources occupied by the R-PDCCH may be different from those of the PDCCH, that is, the R-PDCCH is located in the service domain of LTE Rel-8, and the R-PDCCH may only occupy a part of RBs in the frequency domain. This embodiment provides another method for configuring a CCE of a relay link and transmitting an R-PDCCH.

[0104] Specifically, n consecutive OFDM symbols are allocated in one RB pair to transmit one R-PDCCH, and the value of N4 at this time is the number of REs in one RB pair after removing the reference signal in the n OFDM symbols; The aforementioned reference signals include but are not limited to common reference signals and demodulation reference signals.

[0105] For example, assuming that the subframe has a common CP length, and assuming that the R-PDCCH occupies the 4th, 5th, 6th, and 7th OFDM symbols of the 1st slot in the relay subframe, then except for the reference signal, each RB pair There are 32 REs available in t...

Embodiment 3

[0113] Since the resource occupied by the R-PDCCH is different from that of the PDCCH, this embodiment provides another method for configuring CCEs of the relay link and transmitting the R-PDCCH.

[0114] In this example, each configured CCE includes N2 REGs, and each configured REG includes 3 valid REs, that is, N3 is 3. An example of the definition of a REG under the normal CP length is shown in Fig. 9 . In Figure 9, Figure 9a , Figure 9b and Figure 9c In turn, respectively represent the REG form without a reference signal in an OFDM symbol of a PRB, the REG form of a reference signal with 4 REs in an OFDM symbol of a PRB, and the REG form with 6 REs used for a reference signal in an OFDM symbol of a PRB form. When there is no reference signal in the OFDM symbol, 4 REGs are included in the OFDM symbol; when there are 4 REs used for reference signals in the OFDM symbol, the remaining 8 REs can be used for R-PDCCH transmission. RB contains 2 REGs, and 1 RE is left in e...

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Abstract

The invention provides a relay link downlink control information configuration method, a transmission base station, a relay station and a method. The transmission method comprises the following steps: the base station transmits a relay link physical downlink control channel on N1 continuously or discretely distributed control channel units while sending downlink control information to the relay station; each control channel unit comprises N2 resource unit groups, and each resource unit group comprises N3 effective resource units; or each control channel unit comprises N4 effective resource units. By adopting the technical scheme in the invention, the problem in sending the relay link physical downlink control information is solved; the structure of the relay link downlink physical resource is fully considered with respect to bearing of the relay link physical downlink control information described by the invention at the same time; the multiplexing and transmission flexibility of the relay link downlink control information is ensured; and the influence on terminals is avoided in the meantime.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a relay link downlink control information configuration method, a transmission base station, a relay station and the method. Background technique [0002] At present, the development requirement of mobile communication is to support higher transmission rate, better signal coverage and higher resource utilization. In order to achieve a high transmission rate, the next generation mobile communication system will use a higher frequency bandwidth to transmit signals, and a higher frequency bandwidth will bring greater path loss at the same time, affecting network coverage. The relay (Relay) technology can increase the coverage and balance and increase the throughput of the cell, and the relay node (Relay Node, RN for short) has a relatively small configuration cost compared with the base station. Therefore, the relay is regarded as a 3GPP (3 rd Generation Partnership Pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04W72/12
CPCH04B7/2606H04B7/155H04B7/2656H04W72/042H04L5/0053H04W72/23
Inventor 吴栓栓毕峰梁枫袁明杨瑾
Owner ZTE CORP
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