INFORMATION TRANSMISSION METHOD, ACCESS POINT, AND USER EQUIPMENT

• US 20170244466A1
• Filed: 05/05/2017
• Published: 08/24/2017
• 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
• Granted Patent: US 10,305,572 B2
• Time in Patent Office: 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 27/26136 Pilot sequence conveying additional information
• 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. An information transmission method, 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.

2. The method according to claim 1, 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.

3. The method according to claim 1, wherein the method further comprises:

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.

4. An information transmission method, comprising:

receiving an indication message sent by an access point AP, wherein the indication message comprises additional long training field instruction information, and the additional long training field instruction information is used to instruct the AP whether to send an additional long training field;

when the additional long training field instruction information instructs the AP to send the additional long training field, determining a target quantity of OFDM symbols used by the AP for sending the additional long training field;

receiving, according to the target quantity of OFDM symbols, the additional long training field and an initial long training field that are sent by the AP; and

performing channel estimation according to the additional long training field and the initial long training field.

5. The method according to claim 4, wherein the additional long training field instruction information comprises a target quantity of OFDM symbols used by the AP for sending the additional long training field;

and

the determining a target quantity of OFDM symbols used by the AP for sending the additional long training field comprises;

determining the target quantity that is of OFDM symbols used by the AP for sending the additional long training field and is comprised in the additional long training field instruction information as the target quantity of OFDM symbols used by the AP for sending the additional long training field.

6. The method according to claim 4, wherein the determining a target quantity of OFDM symbols used by the AP for sending the additional long training field comprises:

obtaining a maximum OFDM symbol quantity of a frequency band used for downlink transmission and a maximum OFDM symbol quantity of a subband to which user equipment belongs; and

determining, according to the maximum OFDM symbol quantity of the frequency band and the maximum OFDM symbol quantity of the subband to which the user equipment belongs, the target quantity of OFDM symbols used by the AP for sending the additional long training field, wherein the target quantity of OFDM symbols used by the AP for sending the additional long training field 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.

7. An access point, comprising:

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.

8. The access point according to claim 7, 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.

9. The access point according to claim 7, wherein the access point further comprises:

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.

10. User equipment, comprising:

a first receiving module, configured to receive an indication message sent by an access point AP, wherein the indication message comprises additional long training field instruction information, and the additional long training field instruction information is used to instruct the AP whether to send an additional long training field;

a determining module, configured to;

when the additional long training field instruction information comprised in the indication message received by the first receiving module instructs the AP to send the additional long training field, determine a target quantity of OFDM symbols used by the AP for sending the additional long training field;

a second receiving module, configured to receive, according to the target quantity of OFDM symbols that is determined by the determining module, the additional long training field and an initial long training field that are sent by the AP; and

a processing module, configured to perform channel estimation according to the additional long training field and the initial long training field that are received by the second receiving module.

11. The user equipment according to claim 10, wherein the additional long training field instruction information comprised in the indication message received by the first receiving module comprises a target quantity of OFDM symbols used by the AP for sending the additional long training field;

and

the determining module is configured to;

determine the target quantity that is of OFDM symbols used by the AP for sending the additional long training field and is comprised in the additional long training field instruction information as the target quantity of OFDM symbols used by the AP for sending the additional long training field.

12. The user equipment according to claim 10, wherein when the additional long training field instruction information comprised in the indication message received by the first receiving module instructs the AP to send the additional long training field, the user equipment further comprises:

an obtaining module, configured to obtain a maximum OFDM symbol quantity of a frequency band used for downlink transmission and a maximum OFDM symbol quantity of a subband to which the user equipment belongs; and

the determining module is configured to;

determine, according to the maximum OFDM symbol quantity of the frequency band and the maximum OFDM symbol quantity of the subband to which the user equipment belongs that are obtained by the obtaining module, the target quantity of OFDM symbols used by the AP for sending the additional long training field, wherein the target quantity of OFDM symbols used by the AP for sending the additional long training field 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.