CN107872307B - Method for determining resource unit, method for transmitting resource unit related information and corresponding device - Google Patents
Method for determining resource unit, method for transmitting resource unit related information and corresponding device Download PDFInfo
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- CN107872307B CN107872307B CN201710900545.1A CN201710900545A CN107872307B CN 107872307 B CN107872307 B CN 107872307B CN 201710900545 A CN201710900545 A CN 201710900545A CN 107872307 B CN107872307 B CN 107872307B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
Abstract
The embodiment of the invention provides a method for determining a resource unit, a method for transmitting relevant information of the resource unit and a corresponding device, wherein the method for determining the resource unit comprises the following steps: the station decodes an 8-bit resource unit configuration signal in the HE-SIG-B common field, the 8-bit resource unit configuration signal following a structured resource unit configuration rule; and determining a resource unit for the station according to the decoded 8-bit resource unit configuration signal and the position of the user specific field for the station; wherein the structured resource unit configuration rule supports a maximum of 8 users on resource units greater than or equal to 106-tones. By using the technical scheme, the 8-bit resource unit configuration signal can support more than 4 MU-MIMO users.
Description
Technical Field
The present invention relates generally to wireless network communications, and more particularly to HE-SIG-B common field format and indication.
Background
As the demand for wireless communications has increased, the world has benefited from the evolution of the IEEE 802.11 wireless networking standard to accommodate the increasing data usage of more and more users. The latest 802.11ax will enable High Efficiency (HE) networks. It aims to handle higher data rates and higher user loads. The system uses Orthogonal Frequency Division Multiple Access (OFDMA) and Multi-user Multiple-Input and Multiple-Output (MU-MIMO).
Also, different operating bandwidths may be supported and configured. The operating bandwidth is divided according to a predefined criterion. In 11ax, Resource Allocation (RA) needs to be indicated to support OFDMA and/or MU-MIMO. The resource configuration is transmitted in a common portion of the HE-SIG-B field. The resource unit (RU _ allocation signaling) in the common field of the HE-SIG-B signal is defined as 8 bits per 20Mhz PPDU bandwidth). The resource unit configuration indicator defines the resource unit arrangement and the number of MU-MIMO configurations in the frequency domain. How to efficiently use the 8-bit resource unit configuration field remains a challenge.
Disclosure of Invention
The method and the device provided by the embodiment of the invention provide a structured resource allocation indication. In one novel aspect, the structured resource configuration designation is for an 8-bit resource unit configuration in the HE-SIG-B common field for each 20 MHz. The structured resource allocation indication supports more than 4 MU-MIMO users. The structured resource unit configuration rules support resource unit configuration designations for 20MHz,40MHz,80MHz, and 160MHz operating bandwidths.
The embodiment of the invention provides a method for determining a resource unit, which comprises the following steps: the station decodes an 8-bit resource unit configuration signal in the HE-SIG-B common field, the 8-bit resource unit configuration signal following a structured resource unit configuration rule; and determining a resource unit for the station according to the decoded 8-bit resource unit configuration signal and the position of the user specific field for the station; wherein the structured resource unit configuration rule supports a maximum of 8 users on resource units greater than or equal to 106-tones. Wherein the station is located in an orthogonal frequency division multiple access wireless network, and the HE-SIG-B common field has a fixed format; wherein resource allocation information is indicated in the HE-SIG-B common field and the user-specific field.
Optionally, 2 bits of the 8-bit resource unit configuration signal are used as a first class indicator to determine a first class of resource unit configuration. Wherein the first category comprises: a first size category indicating the presence of large resource units greater than or equal to 242-tone resource units, a second size category indicating the presence of 2 106-tone resource units, and at least one of a third size category indicating that the resource units present are resource units smaller than 242-tones and include at most one 106-tone resource unit. Wherein, when the first class is a first size class, the 8-bit resource unit configuration signal comprises: 2 bits for indicating the size of the existing resource unit, and 3 bits for indicating the number of stations scheduled on the resource unit. When the first class is the second size class, a first set of 3 bits in the 8-bit resource unit configuration signal represents the number of sites on a first 106-tone resource unit and a second set of 3 bits in the 8-bit resource unit configuration signal represents the number of sites on a second 106-tone resource unit.
Optionally, when the first class is the third size class, where a second class indicator with 3 bits in the 8-bit resource unit configuration signal indicates a configuration manner of a non-large resource unit of the third size class, the configuration manner includes: one 106-tone resource unit on a first portion of a channel, one 106-tone resource unit on a second portion of the channel and only small resource units smaller than 106-tones are present on the channel, wherein the second class indicator comprises the 2 bits as the first class indicator. Optionally, a second bit in the second category indicator indicates whether 106-tone resource units are present on a first portion of the 20MHz channel, and a third bit in the second category indicator indicates whether 106-tone resource units are present on a second portion of the 20MHz channel. Wherein if one of the second bit and the third bit indicates the presence of a 106-tone resource unit, the 8-bit resource unit configuration signal further comprises: a 3 bit indicator and a 2 bit indicator, wherein the 3 bit indicator represents the number of sites on the 106-tone resource unit; wherein the 2-bit indicator represents one of 4 resource unit configurations on a portion of the 20MHz channel where no 106-tone resource units are present, the 4 resource unit configurations comprising: a first configuration representing 4 26-tone resource elements, a second configuration representing 1 52-tone resource element and 2 26-tone resource elements, a third configuration representing 2 26-tone resource elements and 1 52-tone resource element, and a fourth configuration representing 2 52-tone resource elements. Wherein, optionally, the frequency of the 52-tone resource unit in the second configuration is less than the frequency of the 2 26-tone resource units; the frequency of the 2 26-tone resource units in the third configuration is less than the frequency of the 1 52-tone resource unit.
Wherein determining the resource unit for the station according to the decoded 8-bit resource unit configuration signal and the location of the user-specific field for the station comprises: determining resource units for the site based on a lookup table for resource unit configuration generated according to the structured resource unit configuration rule and a location of a user-specific field for the site, wherein the lookup table is maintained in the site.
An embodiment of the present invention provides a method for transmitting information related to a resource unit, including: a network entity in an orthogonal frequency division multiple access wireless network allocates resource units for one or more stations; encoding an 8-bit resource unit configuration signal into an HE-SIG-B common field for each 20MHz resource block according to a structured resource unit configuration rule, wherein the structured resource unit configuration rule supports a maximum of 8 users on resource units greater than or equal to 106-tones; wherein the 8-bit resource unit configuration signal and user-specific field in the HE-SIG-B common field indicate information of resource units allocated by the network entity; and transmitting the HE-SIG-B common field and the user-specific field to one or more stations.
Wherein 2 bits of the 8-bit resource unit configuration signal are encoded to indicate a first class of resource unit configurations. The first bit in the 8-bit resource unit configuration signal is set to 1 if there are resource units having a size greater than 106-tones or 2 resource units of 106-tones, and is set to 0 otherwise. When there is a resource unit having a size greater than 106-tones, a second bit in the 8-bit resource unit configuration signal is set to 1, and the 8-bit resource unit configuration signal further includes: 3 bits encoded to indicate the number of stations, 2 bits encoded to indicate the resource unit size. When there are 2 resource elements of 106-tones, a second bit in the 8-bit resource element configuration signal is set to 0, wherein the 8-bit resource element configuration signal further includes: a first set of bits representing a number of sites on a first 106-tone resource unit, the first set of bits having 3 bits; a second set of bits representing a number of sites on a second 106-tone resource unit, the second set of bits having 3 bits. Wherein the first bit and the second bit are different bits.
Optionally, the first bit is set to 0, and a second bit in the 8-bit resource unit configuration signal indicates whether 106-tone resource units exist in a first half of the 20MHz channel, and a third bit in the 8-bit resource unit configuration signal indicates whether 106-tone resource units exist in a second half of the 20MHz channel. Wherein the first bit, the second bit and the third bit are different bits. If one of the second bit and the third bit indicates the presence of a 106-tone resource unit, further comprising in the 8-bit resource unit configuration signal: a 3-bit indicator representing a number of stations on a 106-tone resource unit, and a 2-bit indicator representing that one of 4 resource unit configurations exists on a portion of a 20MHz channel without 106-tone resource units, the 4 resource unit configurations comprising: a first configuration representing 4 26-tone resource elements, a second configuration representing 1 52-tone resource element and 2 26-tone resource elements, a third configuration representing 2 26-tone resource elements and 1 52-tone resource element, and a fourth configuration representing 2 52-tone resource elements.
Optionally, a network entity in the ofdma wireless network stores a lookup table for resource unit configuration, where the lookup table is generated according to the structured resource unit configuration rule, and the network entity in the ofdma wireless network encodes an 8-bit resource unit configuration signal for each 20MHz resource block into an HE-SIG-B common field according to the lookup table.
An embodiment of the present invention provides a station, including: a radio frequency transceiver for transmitting and receiving wireless signals in an orthogonal frequency division multiple access wireless network; a resource configuration decoder for decoding an 8-bit resource unit configuration signal in an HE-SIG-B common field in a received wireless signal according to a structured resource unit configuration rule; wherein the structured resource unit configuration rule supports a maximum of 8 users on resource units greater than or equal to 106-tones; and the resource unit management circuit is used for determining the resource unit for the site according to the decoded 8-bit resource unit configuration signal and the position of the user specific field for the site.
An embodiment of the present invention provides an 8-bit resource unit configuration signal, where the 8-bit resource unit configuration signal is obtained according to a structured resource unit configuration rule, and the structured resource unit configuration rule supports at most 8 users on resource units greater than or equal to 106-tones, so that the 8-bit resource unit configuration signal can support more than 4 MU-MIMO users.
Drawings
Further details, aspects and embodiments of the invention will be described, by way of example only, with reference to the accompanying drawings. Elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. To facilitate understanding, the same reference numerals are included in the various figures.
Fig. 1 is a diagram of an exemplary wireless communication network 100 with 802.11ax capable stations (stations) provided by an embodiment of the present invention;
fig. 2 is a simplified block diagram of a wireless station 101 and a base station 102;
FIG. 3 is a schematic diagram of resource unit partitioning in an 802.11ax system provided by an embodiment of the present invention;
FIG. 4 illustrates an exemplary diagram of a structured 8-bit resource unit configuration provided by an embodiment of the present invention;
FIG. 5 is a diagram illustrating a classification of an 8-bit resource unit configuration indicator with the first 2 bits according to an embodiment of the present invention;
FIG. 6 is an exemplary flowchart of a UE/transceiver decoding an 8-bit resource unit configuration indication according to an embodiment of the present invention;
fig. 7 illustrates an exemplary flowchart of a transmitter encoding an 8-bit resource unit configuration indication provided by an embodiment of the present invention;
FIG. 8 illustrates an exemplary LUT provided by embodiments of the present invention, the LUT being built based on structured signal rules;
fig. 9 is an exemplary flowchart illustrating a STA performing a structured resource allocation indication according to an embodiment of the present invention;
fig. 10 is an exemplary flowchart illustrating a network entity performing a structured resource allocation indicator according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to some embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Fig. 1 illustrates an exemplary wireless communication network 100 with 802.11ax capable Stations (STAs) provided by embodiments of the present invention. The wireless communication system 100 includes one or more wireless communication networks, and each wireless communication network has fixed infrastructure elements, such as wireless communication base stations 105 and 106. A base station may also be called an access point (access point), an access terminal, or a station operating in a software access point mode. Each of the wireless communication base stations 105 and 106 serves a geographical area. The geographical areas served by the wireless communication base stations 105 and 106 overlap.
Wireless mobile stations or Stations (STAs) 101 and 102 in wireless network 100 are served by base station 105. The STAs 101,102 and the base station 105 support 802.11 ax. Other wireless communication devices, such as wireless communication devices 103,107, and 108, are served by different base stations 106. The base station 106 may support different wireless standards, such as LTE, or may also support 802.11 ax. The STAs 101 and 102 transmit uplink data to the base station 105 via an uplink channel in the time and/or frequency domain. The STAs 101 and 102 receive downlink data from the base station 105 via a downlink channel.
In one embodiment, the communication system uses Orthogonal Frequency Division Multiple Access (OFDMA). The wireless network 100 also supports MU-MIMO. The radio resources are divided into resource blocks for multiple users.
Fig. 2 further shows a simplified block diagram of a wireless station 101 and a base station 102 provided by the present invention.
The base station 105 has an antenna 126 that transmits and receives radio signals. The RF transceiver 123, which is coupled to the antenna, receives RF signals from the antenna 126, converts the received RF signals to baseband signals, and sends them to the processor 122. Note that an antenna herein may refer to a single antenna or a group of antennas (i.e., multiple antennas). The RF transceiver 123 also converts baseband signals received from the processor 122, converts the baseband signals to RF signals, and transmits the RF signals to the antenna 126. The processor 122 processes the received baseband signals and invokes different functional modules to perform functions in the base station 105. The memory 121 stores program instructions and data 124 for controlling the operation of the base station 105. The base station 105 also includes a set of control modules, such as an HE-SIG-B processor 125, that perform functional tasks for HE-SIG-B functions and transmit the HE-SIG-B fields to the STAs 101.
Fig. 3 shows an exemplary diagram of 20MHz resource element partitioning in an 802.11ax system according to an embodiment of the present invention. In one embodiment, the resource configuration is based on the configured/defined operating bandwidth, as shown. The 20MHz block diagram 201 shows a resource unit configuration for a 20MHz bandwidth. The 20MHz can be divided into 9 26-tone resource units, 4 52-tone resource units, 2 106-tone resource units and 26-tone midtone units, and one 242-tone unit. As shown in fig. 3,1, 2,3,4,5,6,7,8,9, are 26-tone resource units; 10,11,12,13 are 52-tone resource units; 14,15 are 106-tone resource units; 16 is 204-tone resource unit; in one embodiment, the structured label allocates an 8-bit field for each 20MHz resource configuration. MU-MIMO is supported at 106-tones and 242-tones in the 20MHz block. Therefore, for each of the configured 106-tone and 242-tone, the number of users in the 8 bits that need to be contained on the configured 106-tone and 242-tone resource elements. Using the conventional 8-bit configuration design has a problem that only 2 bits are left to indicate the number of MU-MIMO users, so that a maximum of 4 users is supported, which limitation is not sufficient. In one example, the first two bits of the 8-bit resource unit configuration field are used to define different classes of resource unit configurations, and 3 bit configurations are provided in the 8-bit resource unit configuration field to indicate the number of MU-MIMO users, up to 8 users may be provided.
Fig. 4 shows an exemplary diagram of a structured 8-bit resource unit configuration provided by an embodiment of the present invention. In one novel aspect, a structured label is used. The 8 bits are designed according to predefined rules and the network encodes and the UE decodes accordingly. It reduces the complexity of the lookup table, saves memory space, and improves efficiency. In one example, BIT 1(BIT-1) is designed to distinguish between large Resource Units (RUs) and small resource units. In step 301, if BIT 1(BIT-1) is set to 1, it indicates that there are 242-tones and resource units larger than 242-tones, or that there are two 106-tones. In step 302, if BIT 1(BIT-1) is set to 0, it indicates that there is no large resource unit. For the case where there is a large resource unit, BIT 2 (e.g., BIT-2) is set to 1 to indicate that there is a resource unit greater than or equal to 242-tones in step 311. In another case where there are large resource units, BIT 2 (e.g., BIT-2) is set to 0 at step 312, indicating that two 106-tones are configured. Once the first two bits of decoding indicate a large resource unit class, the decoding formats of the two branches are determined. In step 331, in case the first two bits are "11", the 8-bit resource unit flag has the format "11, yyy, aa, b". In step 332, in case that the first two bits are "10", the 8-bit resource unit flag has the format "10, yyy, aa, b". In both cases, yyy is a 3-bit field indicating the number of users. "aa" is a 2-bit field indicating the type of large resource unit. In one embodiment, "aa" is encoded following a predefined rule, where the predefined rule is 242-RU (00),484-RU (10),996-RU (01), or 2 × 996-RU (11), e.g., aa ═ 00, indicating that the large resource unit is 242-tone resource unit; aa is 10, indicating that the large resource unit is a 484-tone resource unit; aa ═ 01, indicating that the large resource unit is a 996-tone resource unit; aa is 11, indicating that the large resource unit is a 2 × 996-tone resource unit. Alternatively, in step 332, the 8-bit resource unit indicator has the format "10, yyy, yyy" in case the first two bits are "10", where the first 3 bits yyy indicates the number of MU-MIMO stations on the first 106 tone resource unit and the last 3 bits yyy indicates the number of MU-MIMO stations on the second 106 tone resource unit.
By looking at BIT 2 and BIT 3, the branch for small-sized resource units, i.e., BIT 1(BIT-1) equals 0, is decoded. In step 313, BIT 2(BIT-2) is set to "1" indicating that the first portion of the channel has resource units of 106-tones.
At step 314, BIT 3(BIT-3) is set to "1," indicating that the second portion of the channel has resource units of 106-tones. Therefore, in step 333 following step 313, the format of the 8-bit resource element indicator is determined to be "010, yyy, cc". In step 334, which follows step 314, the format of the 8-bit resource unit indicator is determined to be "001, yyy, cc". "yyy" of step 333 indicates the number of users in the 106-tone resource units of the first part, and "cc" of step 333 indicates the type of resource units smaller than 106-tone in the second part; "yyy" in step 334 indicates the number of users in the 106-tone resource units of the second part, and "cc" in step 334 indicates the type of resource units smaller than 106-tone in the first part. In one example, "cc" is defined as follows: "11" two 52-tone resource units; "10" { 522626 } tone resource element; { 262652 } tone resource element; "00" 4 26-tone resource units. Specifically, if BIT 2(BIT-2) is set to "1", indicating that the first portion of the channel has resource units of 106-tones, BIT 3(BIT-3) is set to "0", indicating that the second portion of the channel has resource units less than 106-tones, yyy of step 333 indicates the number of users in the 106-tone resource units of the first portion of the channel, and cc of step 333 indicates the type of the resource units less than 106-tones that the second portion of the channel has;
if BIT 3(BIT-3) is set to "1", indicating that the second portion of the channel has resource units of 106-tones, BIT 2(BIT-2) is set to "0", indicating that the first portion of the channel has resource units of less than 106-tones, and "yyyy" of step 334 indicates the number of users in the 106-tone resource units of the second portion of the channel; "cc" of step 334 indicates the type of resource units in the first portion of the channel that are smaller than 106-tones.
If BIT 2(BIT-2) and BIT 3(BIT-3) are both 0, then the format is defined in steps 335 and 336 as: "000, cccc, 0". "cccc" indicates whether the two pairs are 52-tones or 26-tones. For example, at step 335, the format is "000,1111, 0" for all 52-tone resource units. Similarly, the format is "000, 0000, 0" for all 26-tone resource units. In one novel aspect, a 3-bit field is used to support a number of MU-MIMO users that exceeds 4 users. "011 xxxxx", "000 xxxx 1" and "11 xxxxx 1" are reservation indexes.
Table 1 (below) shows an example table of an 8-bit format using a structured resource configuration indication provided by an embodiment of the present invention. The first column represents the value of the first 2 bits or the first 3 bits of the 8-bit designation. The second column is the format of the remaining bits, 6 bits remaining for the first 2 bits, or 5 bits remaining for the first 3 bits. The third column describes the configuration type. There are 8 configuration types, "000, 0 cccc", "000, 1 rrrr", "001, cc, yyy", "010, cc, yyy", "011, rrrrrr", "10, yyy, yyy", "11, 0aa, yyy", and "111, rrrr". The 3-bit "yyy" field indicates the number of STAs following the format. "cc" is a type field used by the network and the UE. "aa" is the type field for tones greater than 242. In one embodiment, the first 2 bits and the first 3 bits are used to indicate the type of format. The remaining bits are correspondingly encoded. The tables and definitions shown here are the preferred configurations.
TABLE 1
Fig. 5 illustrates the classification of an 8-bit resource unit configuration using the first 2 bits provided by an embodiment of the present invention. In one novel aspect, 2 bits are used to classify the 8-bit resource unit configuration indication field, which enables the indication to support up to 8 users for MU-MIMO instead of 4 users. If the first 2 bits are "11", the class of the resource unit configuration field is determined to be for indicating a large resource unit 510, i.e., if the first 2 bits are "11", the channel has a large resource unit 510. If the first 2 bits are "10", the class of the resource unit configuration field is determined to indicate 2 106-tones 520, i.e., if the first 2 bits are "10", there are 2 106-tones 520 of the channel. If the first 2 bits are "0 x", including "01" and "00", the class of the resource unit configuration field is determined to be used to indicate a non-large resource unit 530, i.e., if the first 2 bits are "0 x" channel there is a non-large resource unit 530. Following these 3 class specifications, an 8-bit resource unit configuration field is defined accordingly. In one example, the categories 530 are further divided into a second set of categories. A 3-bit second class indicator is used. The second class indicator includes two bits and an additional bit for the first class. Class 591 is denoted as "010" indicating 106-tone resource units in the first half of the channel. The category 592 is denoted as "001," indicating that the 106-tone resource unit is in the second half of the channel. The category 593 is denoted as "000" and represents only small resource units, representing 52-tone resource units and 26-tone resource units. Bit "111" represents a reserved bit.
For class 510, there is included a 3 bit field 511 indicating the number of sites, a 2 bit field 512 indicating the type of resource unit, and a reserved bit 513. For category 520, a 3-bit field is included that indicates the number of sites on the first portion of 106-tones and a 3-bit field that indicates the number of sites on the second portion of 106-tones.
For class 530, the "010" configuration remainder field includes a 3-bit field 531 indicating the number of sites on the 106-tones of the first portion, and a 2-bit field 532 indicating the 26-tone and/or 52-tone type. The '001' configures the remaining field to include a 2-bit type field 541 indicating whether it is a 106-tone or a real small resource unit (item), the 2-bit type field 541 may indicate a type of the small resource unit, such as 2 26 tones and 1 52 tones, 4 26 tones, etc., and a 3-bit field 542 indicating the number of stations on the second part of 106-tones. "000" configures a 4-bit field 551, and the 4-bit field 551 indicates whether the resource unit is a 26-tone type or a 52-tone type. Reference numeral 552 indicates that the corresponding bit is 0; "111" indicates that the last 5 bits 561 are reserved.
Fig. 6 is an exemplary flowchart for decoding an 8-bit resource unit configuration indicator by a UE/receiver according to an embodiment of the present invention. In one example, the receiver of the 8-bit resource unit configuration index decodes the meaning of the 8-bit resource unit configuration index according to a predefined rule without using a LUT to determine the resource configuration. The receiver, usually at the UE side, detects each bit according to predefined rules and determines the meaning of the latter according to the setting of the preceding bit. The receiver starts with bit 1 (denoted b1) and moves forward. In one novel aspect, the first 2 bits (b1b2) of the 8-bit resource unit configuration indicator are grouped to classify the resource unit configuration signal.
In step 601, the receiver detects whether b1b2 is equal to "11". If step 601 determines yes, the receiver performs step 611 and determines that b3b4b5 represents the number of stations, determines that b6b7 represents the type of resource unit size, and b8 is reserved. If the determination of step 601 is negative, the receiver performs step 602. In step 602, the receiver determines whether b1b2 is equal to "10". If step 602 determines yes, the receiver performs step 612 and determines b3b4b5 as the number of stations on the first portion of the channel and determines b6b7b8 as the number of stations on the second portion of the channel. If the determination of step 602 is negative, the receiver performs step 603.
In step 603, the receiver determines whether b1 is equal to 0. If the determination of step 603 is negative, the receiver performs step 641 and regards the remaining bits as reserved bits. If the determination of step 603 is yes, the receiver performs step 621. In step 621, the receiver determines whether b2b3 is equal to "10". If step 621 determines that b2b3 is equal to "10", the receiver performs step 631 and determines that b4b5b6 represents the number of stations on the 106-tone and that b7b8 represents the resource unit pattern of the second part of the channel. In one example, b7b8 is defined as follows: "11" two 52-tone resource units; "10" {52,2626} tone resource element; { 262652 } tone resource element; "00" 4 26 tone resource units. If the determination at step 621 is negative, the receiver performs step 622.
In step 622, the receiver determines whether b2b3 is equal to "01". If the determination at step 622 is yes, the receiver performs step 632 and determines that b4b5 represents a resource unit pattern (which may also be referred to as a channel pattern) for the first portion of the channel and that b6b7b8 indicates the number of stations on the 106-tone. In one embodiment, b4b5 is defined as follows: "11" two 52-tone resource units; "10" { 522626 } tone resource element; { 262652 } tone resource element; "00" 4 26-tone resource units. If the determination at step 622 is negative, the receiver performs step 623.
In step 623, the receiver determines whether b2b3 is equal to "00". If the determination of step 623 is yes, the receiver performs step 633 and determines that b4b5 indicates a resource element pattern on the first part of the channel and that b6b7 indicates a resource element pattern on the second part of the channel. In one example, b4b5 and b6b7 are defined as follows: "11" two 52-tone resource units; "10" {52,2626} tone resource element; { 262652 } tone resource element; "00" 4 26-tone resource units. If step 623 determines no, the receiver performs step 641 and takes the remaining bits as reserved bits.
Fig. 7 is a flowchart illustrating the behavior of a transmitter to encode an 8-bit resource unit configuration indication according to an embodiment of the present invention. In one embodiment, a transmitter (e.g., an eNB or a network entity) encodes an 8-bit resource unit configuration indication field based on the size of the resource unit according to a predefined rule. In step 701, the transmitter determines whether there is a resource unit greater than or equal to 242-tone. If the determination of step 701 is yes, the transmitter performs step 711 and sets b1 to 1, b2 to 1, b3b4b5 to indicate the number of stations on the 242-tone resource unit or more, b6b7 to indicate the size type of the 242-tone resource unit or more, and b8 to 0. In one example, b6b7 is defined as follows: 242-RU (00),484-RU (10),996-RU (01), or 2 × 996-RU (11). If the determination of step 701 is negative, the transmitter performs step 702.
In step 702, the transmitter determines whether there are 2 106-tones. If the determination of step 702 is yes, the transmitter performs step 712 and sets b1 to 1 and b2 to 0, sets b3b4b5 to indicate the number of 106-tone sites in the first portion and sets b6b7b8 to indicate the number of 106-tone sites in the second portion. If the determination of step 702 is no, the transmitter performs step 703 and sets b1 to 0. After setting b1 to 0 in step 703, the transmitter performs step 721.
In step 721, the transmitter determines whether a 106-tone is present in the first portion. If the determination of step 721 is yes, the transmitter performs step 731, and sets b2b3 to "10", sets b4b5b6 to indicate the number of sites of 106-tones, sets b7b8 to indicate the resource unit pattern of the second part of the channel, e.g., b7b8 is the pattern index of the second part of the channel. In one example, b7b8 is defined as follows: "11" 2 52-tone resource units; "10" { 522626 } tone resource element; { 262652 } tone resource element; "00" 4 26 tone resource units. If the determination at step 721 is negative, the transmitter performs step 722. In step 722, the transmitter determines whether a 106-tone is present in the second portion.
If the determination of step 722 is yes, the transmitter performs step 732 and sets b2b3 to "01", sets b4b5 to indicate the resource element pattern on the first part of the channel, e.g., to indicate the pattern index on the first part of the channel, and sets b6b7b8 to indicate the number of stations for the 106-tone. In one example, b4b5 is defined as follows: "11": 2 52-tone resource units; "10" { 522626 } tone resource element; { 262652 } tone resource element; "00" 4 26-tone resource units. If the determination in step 722 is negative, the transmitter determines in step 741 that there are no resource units greater than 106-tone and performs step 733. In step 733, the transmitter sets b2b3 to "00", and sets b4b5 to indicate a resource unit pattern on a first part of the channel, e.g., a pattern index of the first part of the channel, and sets b6b7 to indicate a resource unit pattern on a second part of the channel, e.g., a pattern index of the second part of the channel. In one example, b4b5 and b6b7 are defined as follows: "11": 2 52-tone resource units; "10": { 522626 } tone resource element; "01": { 262652 } tone resource element; "00": 4 26-tone resource units.
It will be appreciated by those skilled in the art that the reference numerals for bit-1, b1, b1b2, b4b5b6, for example, are the relative positions of the 8-bit fields. Other common identifiers, such as an identifier representing an 8-bit field of b7b6b5b4b3b2b1b0, can be substituted for the identifiers in the previous figures. Also, in other embodiments, bit-1 may be encoded at the position of b7 in b7b6b5b4b3b2b1b 0. Similarly, b8 or bit-8 can be encoded in the position of b0 in b7b6b5b4b3b2b1b 0.
In one novel aspect, a resource unit RU configuration look-up table is established in accordance with the above-described structural rules. The look-up table LUT can be built according to rules, either statically stored or dynamically generated. The UE can determine the resource configuration according to a structured signal rule or by searching a LUT established based on the rule. In the alternative, the UE can obtain the RU configuration information using a combination of the LUT and the structured signal rules.
Fig. 8 shows an example of an LUT built according to the structured signal rule provided by an embodiment of the present invention. The first column shows an 8-bit layout. The bit order is b7b6b5b4b3b2b1b 0. The last 9 columns show the corresponding Resource Units (RUs) at the corresponding locations. The last column shows the number of supported users per 8-bit pattern. MU-MIMO supports Resource Units (RUs) of size greater than or equal to 106-tones. 0001rrrr,011rrrrr, and 111rrr are reserved and used to carry other information. The LUTs are classified according to structured labeling rules. Row 801 includes configurations that support OFDMA only. Line 802 supports OFDMA and MU-MIMO, with one resource unit RU supporting MU-MIMO. Line 803 supports OFDMA and MU-MIMO, with 2 resource units RU supporting MU-MIMO. Line 804 is a large RU. In an optional embodiment, the LUT is established according to a structured resource unit configuration rule, the LUT is stored in the network entity and the station, the network entity encodes and transmits an 8-bit resource unit configuration signal by using the LUT, and the station decodes the 8-bit resource unit configuration signal according to the LUT after receiving the 8-bit resource unit configuration signal.
Fig. 9 illustrates an exemplary process of STA decoding a structured resource allocation indicator according to an embodiment of the present invention. At step 901, a STA receives at least one wireless signal;
in step 902, the STA decodes an 8-bit resource unit configuration signal in an HE-SIG-B common field in a wireless signal according to a structured Resource Unit (RU) configuration rule that supports a maximum of 8 users on resource units greater than or equal to 106-tones.
In step 903, a Resource Unit (RU) for the STA is determined according to the decoded 8-bit resource unit configuration signal and a position of a user specific field for the STA among a plurality of user specific fields corresponding to the 8-bit resource unit configuration signal in the wireless signal. The 8-bit resource unit configuration signal and the user-specific fields may be transmitted in one wireless signal (e.g., one packet) or may be transmitted in two separate wireless signals (e.g., 2 packets).
The wireless signal comprises an 8-bit resource unit configuration signal and a plurality of user-specific fields, wherein each user-specific field has a user ID indicating which STA the user-specific field corresponds to. Wherein the order of the user specific fields in the radio signal corresponds to the order of the resource units indicated in the 8-bit resource unit configuration signal.
For example, the 8-bit resource unit configuration signal b1b2b3b4b5b6b7b8 is 10010001, i.e., the STA can determine from the first 2 bits 10 that the channel includes 2 106 tone resource units and 26 tone resource units located between the 2 106 tone resource units, b4b5b6 is the number of STAs on the first 106 tone resource unit, which is assumed to be 2 in this example, and b6b7b8 is the number of STAs on the second 106 tone resource unit, which is assumed to be 1 in this example. The 8-bit resource unit configuration signal 10010001 indicates that the operating bandwidth of the channel includes 2 106 tone resource units and 26 tone resource units located between the 2 106 tone resource units, the number of STAs of the first 106 tone resource unit is 2, and the number of STAs of the second 106 tone resource unit is 1. At this time, 4 user-specific fields are carried in the wireless signal. If the user specific field containing the user ID of the STA is 1 st or 2 nd, the STA is allocated to the first 106 tone resource units; if the user specific field containing the user ID of the STA is 3 rd, the STA is allocated to a 26 tone resource unit located between the first 106 tone resource unit and the second 106 tone resource unit; if the user specific field containing the user ID of the STA is the 4 th one, the STA is allocated to the second 106 tone resource units.
Fig. 10 is an exemplary flowchart illustrating a network entity performing a structured resource allocation indicator according to an embodiment of the present invention. In step 1001, a network entity configures resource unit allocations for one or more STAs in an OFDMA wireless network, wherein information of the resource allocations is indicated in a HE-SIG-B common field and a user-specific field, the HE-SIG-B common field for the resource unit information having a fixed format. In step 1002, the network entity encodes an 8-bit resource unit configuration signal in the HE-SIG-B common field for each 20MHz resource block according to a structured resource unit configuration rule that supports a maximum of 8 users on resource units greater than or equal to 106-tones. In step 1003, the network entity sends an 8-bit resource unit configuration signal to one or more STAs.
While the invention has been described in connection with certain specific embodiments, it is not limited thereto. For example, although the present invention is described taking an LTE-advanced (LTE-advanced) mobile communication system as an example, the present invention can be similarly applied to other mobile communication systems such as a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system. Therefore, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (20)
1. A method of determining resource units,
the station decodes an 8-bit resource unit configuration signal in the HE-SIG-B common field, the 8-bit resource unit configuration signal following a structured resource unit configuration rule; and
determining a resource unit for the station according to the decoded 8-bit resource unit configuration signal and a position of a user specific field for the station;
wherein the structured resource unit configuration rule supports a maximum of 8 users on resource units greater than or equal to 106-tones;
wherein 2 bits of the 8-bit resource unit configuration signal are used as a first class indicator to indicate a specific size class in a first class of resource unit configurations, the first class including: a first size category indicating the presence of large resource units greater than or equal to 242-tone resource units, a second size category indicating the presence of 2 106-tone resource units, and a third size category indicating that the present resource units are resource units smaller than 242-tones and include at most one 106-tone resource unit.
2. The method of claim 1,
the station is located in an orthogonal frequency division multiple access wireless network, and the HE-SIG-B common field has a fixed format; wherein resource allocation information is indicated in the HE-SIG-B common field and the user-specific field.
3. The method of claim 1, wherein when the first class indicator indicates a first size class, the 8-bit resource unit configuration signal comprises: 2 bits for indicating the size of the existing resource unit, and 3 bits for indicating the number of stations scheduled on the resource unit.
4. The method of claim 1, wherein when the first class indicator indicates the second size class, a first set of 3 bits in the 8-bit resource unit configuration signal indicates a number of sites on a first 106-tone resource unit, and a second set of 3 bits in the 8-bit resource unit configuration signal indicates a number of sites on a second 106-tone resource unit.
5. The method of claim 1, wherein when the first class indicator indicates the third size class, a second class indicator with 3 bits in the 8-bit resource unit configuration signal is used to indicate a specific class in a second group of classes into which the third size class is divided, and the second group of classes comprises: one 106-tone resource unit on a first half of a channel, one 106-tone resource unit on a second half of the channel, and the channel having no 106-tone resource units and having small resource units smaller than 106-tones; the second class indicator includes the 2 bits as the first class indicator.
6. The method of claim 5, wherein a second bit in the second class indicator indicates whether 106-tone resource units are present on a first half of a 20MHz channel, and wherein a third bit in the second class indicator indicates whether 106-tone resource units are present on a second half of the 20MHz channel.
7. The method of claim 6, wherein if one of the second bit and third bit indicates the presence of a 106-tone resource unit, the 8-bit resource unit configuration signal further comprises: a 3 bit indicator and a 2 bit indicator, wherein the 3 bit indicator represents the number of sites on the 106-tone resource unit; wherein the 2-bit indicator represents one of 4 resource unit configurations on a portion of the 20MHz channel where no 106-tone resource units are present, the 4 resource unit configurations comprising: a first configuration representing 4 26-tone resource elements, a second configuration representing 1 52-tone resource element and 2 26-tone resource elements {52,2626}, a third configuration representing 2 26-tone resource elements and 1 52-tone resource element { 262652 }, and a fourth configuration representing 2 52-tone resource elements.
8. The method of claim 1,
determining the resource unit for the station according to the decoded 8-bit resource unit configuration signal and the location of the user-specific field for the station comprises:
determining resource units for the site based on a look-up table for resource unit configuration and a location of a user-specific field for the site, wherein the look-up table is generated based on the structured resource unit configuration rules.
9. A method for transmitting information related to a resource unit, comprising:
a network entity in an orthogonal frequency division multiple access wireless network allocates resource units for one or more stations;
encoding an 8-bit resource unit configuration signal for a 20MHz resource block into an HE-SIG-B common field, wherein the 8-bit resource unit configuration signal complies with a structured resource unit configuration rule that supports a maximum of 8 users on resource units greater than or equal to 106-tones; wherein the 8-bit resource unit configuration signal and user-specific field in the HE-SIG-B common field indicate information of resource units allocated by the network entity; and
transmitting the HE-SIG-B common field and the user-specific field to one or more stations;
wherein 2 bits of the 8-bit resource unit configuration signal are used as a first class indicator to indicate a specific size class in a first class of resource unit configurations, the first class including: a first size category indicating the presence of large resource units greater than or equal to 242-tone resource units, a second size category indicating the presence of 2 106-tone resource units, and a third size category indicating that the present resource units are resource units smaller than 242-tones and include at most one 106-tone resource unit.
10. The method of claim 9, wherein if there are resource units with a size larger than 106-tones or 2 resource units with 106-tones, a first bit of the 8-bit resource unit configuration signal is set to a first value, otherwise, the first bit is set to a second value, one of the first and second values is 0, and the other is 1, wherein the first bit is located in the 2 bits.
11. The method of claim 10, wherein when there are resource units with a size larger than 106-tones, the second bit in the 8-bit resource unit configuration signal is set to a third value, and wherein the 8-bit resource unit configuration signal further comprises: 3 bits encoded to indicate the number of stations, 2 bits encoded to indicate a resource unit size, the second bit being located in the 2 bits as the first class indicator.
12. The method of claim 11, wherein a second bit of the 8-bit resource unit configuration signal is set to a fourth value when there are 2 resource units of 106-tones, wherein the 8-bit resource unit configuration signal further comprises: a first set of bits representing a number of sites on a first 106-tone resource unit, the first set of bits having 3 bits; a second set of bits representing a number of sites on a second 106-tone resource unit, the second set of bits having 3 bits, wherein one of the third and fourth values is 0 and the other is 1.
13. The method of claim 10, wherein the first bit is set to a second value, and wherein a second bit in the 8-bit resource unit configuration signal indicates whether 106-tone resource units are present in a first half of a 20MHz channel, and wherein a third bit in the 8-bit resource unit configuration signal indicates whether 106-tone resource units are present in a second half of the 20MHz channel.
14. The method of claim 13, wherein if one of the second bit and the third bit indicates the presence of a 106-tone resource unit, the 8-bit resource unit configuration signal further comprises: a 3-bit indicator representing a number of stations on a 106-tone resource unit, and a 2-bit indicator representing that one of 4 resource unit configurations exists on a portion of a 20MHz channel without 106-tone resource units, the 4 resource unit configurations comprising: a first configuration representing 4 26-tone resource elements, a second configuration representing 1 52-tone resource element and 2 26-tone resource elements {52,2626}, a third configuration representing 2 26-tone resource elements and 1 52-tone resource element { 262652 }, and a fourth configuration representing 2 52-tone resource elements.
15. The method of claim 9, further comprising:
a network entity in an OFDMA wireless network maintains a look-up table for resource unit configuration, wherein the look-up table is generated according to the structured resource unit configuration rule.
16. The method of claim 15,
encoding an 8-bit resource unit configuration signal for a 20MHz resource block into an HE-SIG-B common field comprises:
according to the lookup table, encoding 8-bit resource unit configuration signals into an HE-SIG-B public field for each 20MHz resource block;
when the first class indicator indicates the third size class, a second class indicator of 3 bits in the 8-bit resource unit configuration signal is used to indicate a specific class in a second group of classes into which the third size class is divided, wherein the second group of classes includes: one 106-tone resource unit on a first half of a channel and one 106-tone resource unit on a second half of the channel, wherein the second category indicator includes the 2 bits as the first category indicator.
17. A station, comprising:
a radio frequency transceiver for transmitting and receiving wireless signals in an orthogonal frequency division multiple access wireless network;
a resource configuration decoder for decoding an 8-bit resource unit configuration signal in an HE-SIG-B common field in a received wireless signal according to a structured resource unit configuration rule; wherein the structured resource unit configuration rule supports a maximum of 8 users on resource units greater than or equal to 106-tones;
a resource unit management circuit, configured to determine a resource unit for the station according to the decoded 8-bit resource unit configuration signal and a location of a user-specific field for the station;
wherein 2 bits of the 8-bit resource unit configuration signal are used as a first class indicator to indicate a specific size class in a first class of resource unit configurations, the first class including: a first size category indicating the presence of large resource units greater than or equal to 242-tone resource units, a second size category indicating the presence of 2 106-tone resource units, and a third size category indicating that the present resource units are resource units smaller than 242-tones and include at most one 106-tone resource unit.
18. The station of claim 17,
when the first class indicator indicates the first size class, the 8-bit resource unit configuration signal includes: 2 bits for indicating the size of the large resource unit, and 3 bits for indicating the number of stations scheduled on the large resource unit;
or, when the first class indicator indicates the second size class, a first set of 3 bits in the 8-bit resource unit configuration signal represents the number of sites on a first 106-tone resource unit and a second set of 3 bits in the 8-bit resource unit configuration signal represents the number of sites on a second 106-tone resource unit;
alternatively, the first and second electrodes may be,
when the first class indicator indicates the third size class, a 3-bit second class indicator in the 8-bit resource unit configuration signal is used to indicate a specific class in a second group of classes into which the third size class is divided, where the second group of classes includes: one 106-tone resource unit on the first half of the channel, one 106-tone resource unit on the second half of the channel and the channel having no 106-tone resource units and having small resource units smaller than 106-tones; the second class indicator includes the 2 bits as the first class indicator.
19. A storage device for storing instructions which, when executed, implement the method of any one of claims 1 to 8.
20. A storage device for storing instructions which, when executed, implement the method of any of claims 9 to 16.
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