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Method for determining multicast server (MCS) in long-term evolution scheduling

A frame length, SNR-CQI technology, applied in the field of communication, can solve the problem of high channel SNR block error rate, and achieve the effect of reducing transmission delay, reducing the probability of HARQ, and saving RB logarithms

Inactive Publication Date: 2012-05-30
PEKING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problem that the block error rate is higher due to channel SNR changing with time, the present invention proposes a method for determining MCS in LTE scheduling, including steps:

Method used

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  • Method for determining multicast server (MCS) in long-term evolution scheduling
  • Method for determining multicast server (MCS) in long-term evolution scheduling
  • Method for determining multicast server (MCS) in long-term evolution scheduling

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Embodiment 1

[0070] The MCS is finally determined with the specific RB logarithmic calculation formula:

[0071]

[0072] n is the number of OFDM symbols used to transmit data services on all subcarriers of an RB pair. And the obtained RB logarithm is an integer value rounded up from the value obtained by the above formula.

[0073] Table 4 shows the size of an RB specified in TS 36.211 (E-UTRA, Physical Channels and Modulation, Release 9). Each RB occupies 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain. . An RB pair refers to two RBs arranged side by side in the time domain, occupying 14 OFDM symbols in the time domain, and 12 subcarriers in the frequency domain.

[0074] Table 4 RB parameter table

[0075]

[0076] SNR is because not all OFDM symbols in each RB pair are used to transmit data, and some symbols transmit control information, and n is the number of symbols that can actually be used to transmit data on all subcarriers of an RB pair. Ass...

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Abstract

The invention discloses a method for determining a multicast server (MCS) in long-term evolution scheduling, which comprises the following steps that: 1) measuring a signal-to-noise ratio (SNR) value; 2) determining a channel quality indicator (CQI) grade CQIO according to an SNR-CQI grade mapping relation; 3) acquiring resource block (RB) pairs according to a length L of a service frame and the CQIO; 4) acquiring the minimal CQI grade under the identical RB pairs according to the RB pairs and the frame length L; 5) and determining a modulation coding way according to the minimal CQI grade. Due to the adoption of the method, the problem that the mistake block rate is high because of the variation of the channel SNR along the time can be solved, the packet loss ratio can be reduced by determining the MCS according to the frame length, the packet transmission delay can be reduced, whether a half continuous scheduling method or a dynamic scheduling method, because a modulation coding way with higher reliability is selected under the situation that the used resource quantity is identical, the SNR variation range born by each packet is correspondently enlarged, and the packet can be better suitable for the variation of the SNR. The performance of the scheduling service can be improved.

Description

technical field [0001] The invention relates to a method for determining a modulation and coding mode MCS in service scheduling, in particular to a method for determining an MCS in LTE scheduling, and the invention belongs to the field of communication technology. Background technique [0002] LTE supports various communication services. In order to provide large-capacity communication services and ensure service quality QoS, it adopts a certain scheduling scheme, and implements effective scheduling and resource allocation through eNodeB. [0003] LTE adopts Adaptive Modulation and Coding (AMC) technology. The user measures the signal-to-noise ratio (SNR) of the channel in the downlink, and the eNodeB measures the SNR of the channel in the uplink. resource. CQI (Channel Quality Indicator, channel quality indicator) is a measurement standard of wireless channel communication quality. Generally, a high value of CQI indicates that a channel has high quality, so CQI can be used...

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Application Information

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IPC IPC(8): H04W28/04H04W72/12
Inventor 刘志敏童菲丁璐
Owner PEKING UNIV
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