Information transmission method, access point, and user equipment

• US 10,305,572 B2
• Filed: 05/05/2017
• Issued: 05/28/2019
• Est. Priority Date: 11/07/2014
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Lu, Weishan, Yu, Jian
• Primary Examiner(s): Varndell, Ross
• Application Number:
  US15/587,470
• Publication Number:
  US 20170244466A1
• Time in Patent Office: 753 Days
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/08 at the receiving station
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A method includes: determining a maximum orthogonal frequency division multiplexing OFDM symbol quantity of a frequency band used for downlink transmission, where the maximum OFDM symbol quantity of the frequency band is a maximum value of maximum OFDM symbol quantities of all subbands of the frequency band; determining, according to a value relationship between a maximum OFDM symbol quantity of a subband to which user equipment belongs and the maximum OFDM symbol quantity of the frequency band, additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment; and sending an indication message to the user equipment, where the indication message includes the additional long training field instruction information.

Claims

1. A method of information transmission, comprising:

determining a maximum orthogonal frequency division multiplexing (OFDM) symbol quantity of a frequency band used for downlink transmission, wherein the maximum OFDM symbol quantity of the frequency band is a maximum value of maximum OFDM symbol quantities of all subbands of the frequency band;

determining, according to a value relationship between a maximum OFDM symbol quantity of a subband to which user equipment belongs and the maximum OFDM symbol quantity of the frequency band, additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment; and

sending an indication message to the user equipment, wherein the indication message comprises the additional long training field instruction information, wherein the determining additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment comprises;

determining the additional long training field instruction information when the maximum OFDM symbol quantity of the subband to which the user equipment belongs is less than the maximum OFDM symbol quantity of the frequency band, wherein the additional long training field instruction information is used to instruct to send the additional long training field to the user equipment;

wherein the method further comprises;

sending the additional long training field and an initial long training field to the user equipment according to the additional long training field instruction information;

or

determining the additional long training field instruction information when the maximum OFDM symbol quantity of the subband to which the user equipment belongs is equal to the maximum OFDM symbol quantity of the frequency band, wherein the additional long training field instruction information is used to instruct not to send the additional long training field to the user equipment.

2. A method of information transmission, comprising:

determining a maximum orthogonal frequency division multiplexing (OFDM) symbol quantity of a frequency band used for downlink transmission, wherein the maximum OFDM symbol quantity of the frequency band is a maximum value of maximum OFDM symbol quantities of all subbands of the frequency band;

determining, according to a value relationship between a maximum OFDM symbol quantity of a subband to which user equipment belongs and the maximum OFDM symbol quantity of the frequency band, additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment;

sending an indication message to the user equipment, wherein the indication message comprises the additional long training field instruction information; and

determining a target quantity of OFDM symbols used for sending the additional long training field to the user equipment, wherein the target quantity of OFDM symbols is less than or equal to a difference between the maximum OFDM symbol quantity of the frequency band and the maximum OFDM symbol quantity of the subband to which the user equipment belongs;

wherein

the additional long training field instruction information comprises the target quantity of OFDM symbols.

3. An access point, comprising:

a memory to store instructions; and

a processor to execute the instructions to implement;

a first determining module, configured to determine a maximum orthogonal frequency division multiplexing (OFDM) symbol quantity of a frequency band used for downlink transmission, wherein the maximum OFDM symbol quantity of the frequency band is a maximum value of maximum OFDM symbol quantities of all subbands of the frequency band;

a second determining module, configured to determine, according to a value relationship between a maximum OFDM symbol quantity of a subband to which user equipment belongs and the maximum OFDM symbol quantity that is of the frequency band and is determined by the first determining module, additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment; and

a sending module, configured to send an indication message to the user equipment, wherein the indication message comprises the additional long training field instruction information determined by the second determining module, wherein the second determining module is configured to;

determine the additional long training field instruction information when the maximum OFDM symbol quantity of the subband to which the user equipment belongs is less than the maximum OFDM symbol quantity that is of the frequency band and is determined by the first determining module, wherein the additional long training field instruction information is used to instruct to send the additional long training field to the user equipment;

wherein

the sending module is configured to;

send the additional long training field and an initial long training field to the user equipment according to the additional long training field instruction information;

or

determine the additional long training field instruction information when the maximum OFDM symbol quantity of the subband to which the user equipment belongs is equal to the maximum OFDM symbol quantity that is of the frequency band and is determined by the first determining module, wherein the additional long training field instruction information is used to instruct not to send the additional long training field to the user equipment.

4. An access point, comprising:

a memory to store instructions; and

a processor to execute the instructions to implement;

a first determining module, configured to determine a maximum orthogonal frequency division multiplexing (OFDM) symbol quantity of a frequency band used for downlink transmission, wherein the maximum OFDM symbol quantity of the frequency band is a maximum value of maximum OFDM symbol quantities of all subbands of the frequency band;

a second determining module, configured to determine, according to a value relationship between a maximum OFDM symbol quantity of a subband to which user equipment belongs and the maximum OFDM symbol quantity that is of the frequency band and is determined by the first determining module, additional long training field instruction information used to instruct whether to send an additional long training field to the user equipment;

a sending module, configured to send an indication message to the user equipment, wherein the indication message comprises the additional long training field instruction information determined by the second determining module; and

a third determining module, configured to determine a target quantity of OFDM symbols used for sending the additional long training field to the user equipment, wherein the target quantity of OFDM symbols is less than or equal to a difference between the maximum OFDM symbol quantity of the frequency band and the maximum OFDM symbol quantity of the subband to which the user equipment belongs;

wherein

the additional long training field instruction information determined by the second determining module comprises the target quantity of OFDM symbols that is determined by the third determining module.