CN109451587B - Method for dynamically allocating time slot length of limited access window in wireless network - Google Patents

Method for dynamically allocating time slot length of limited access window in wireless network Download PDF

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CN109451587B
CN109451587B CN201811492996.7A CN201811492996A CN109451587B CN 109451587 B CN109451587 B CN 109451587B CN 201811492996 A CN201811492996 A CN 201811492996A CN 109451587 B CN109451587 B CN 109451587B
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CN109451587A (en
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胡世飞
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Zhuhai Huge Ic Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

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Abstract

The invention discloses a method for dynamically allocating the time slot length of a limited access window in a wireless network, which comprises the following steps: step 1, an access point AP calculates the time slot length required by a jth station Sij of an ith Sub-Block Sub _ Block i, wherein the jth station Sij of the ith Sub-Block Sub _ Block i accesses a channel in a restricted access window RAW, i and j are integers, i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to 8, and N is the number of Sub-blocks Sub _ Block accessing the channel in the restricted access window RAW; step 2, the access point AP obtains a Slot grade table Slot Scale according to the time Slot lengths needed by all stations accessing the channel in the restricted access window RAW; step 3, the access point AP loads the Slot Scale in the frame body of the beacon frame; the invention can indicate the time Slot length needed by all stations accessing the channel in the restricted access window RAW by bearing the time Slot grade table Slot Scale in the beacon frame, so that different stations can allocate different time Slot lengths.

Description

Method for dynamically allocating time slot length of limited access window in wireless network
All as the field of technology
The invention relates to the technical field of wireless communication, in particular to a method for dynamically allocating the time slot length of a limited access window in a wireless network.
All the above-mentioned background techniques
In a WLAN (Wireless Local Area network), after a station STA (station) enters a coverage Area of an access point AP (access point), the access point AP may periodically send a Beacon Frame (Beacon Frame) to the station STA for time synchronization, broadcast information, and the like, and the access point AP represents an address of the station STA by using an association identifier AID.
As shown in fig. 1, the association identifier AID representing the station STA in the related art includes 13 bits (B01-B13), and may represent 8192 (2)130000000000000-; the association identifier AID includes a two-bit Page Index Page Index (B01-B02), a five-bit Page Slice Number Page Number (B03-B07), a three-bit Sub-Block Index Sub _ Block Index (B08-B10), and a three-bit Station Index (B11-B13); as shown in FIG. 2, the Page Index Page Index may represent 4 (2)200-11) pages (Page1-Page4), and the Page Slice Number can represent 32 (2)500000-3000-3000- > 111) stations (Station1-Station 8); each Page includes 32 Page slices Slice, each Page Slice includes 8 Sub-blocks, each Sub-Block includes 8 Station stations.
As shown in fig. 3, the 802.11ah beacon Frame in the prior art includes a Frame Control, a length Duration, a Source Address, a Timestamp, a Next target beacon Frame transmission time (optional) Next TBTT (optional), an Access Network option (optional), a Frame Body Frame and a Frame check sequence FCS; the Frame Body includes a Beacon interval, traffic indication information TIM, a Restricted Access Window (RAW) Parameter Set (PS) Information Element (IE) (hereinafter referred to as RPS), and a manufacturer defined Vendor Specific. The traffic indication information TIM and the restricted window Access parameter set information element RPS define a time period after the beacon frame as a restricted Access window RAW (restricted Access window) within which only a specific station STA is allowed to Access the channel within a specific slot (slot).
As shown in fig. 4, the traffic indication information TIM in the prior art includes an Element identifier Element ID, a Length, a transmission traffic indication information count DTIM count, a transmission traffic indication information Period DTIM Period, a Bitmap Control, and a partial Virtual Bitmap; the Bitmap Control comprises a Traffic indication Traffic Indicator with one bit, a Page Slice Number with five bits and a Page Index with two bits, a partial Virtual Bitmap comprises a Block Control with three bits, a Block Offset with five bits and coding Block Information Encoded Block Information of 8 rows and 8 columns of N +1, wherein N is an integer and is more than or equal to 1 and less than or equal to 8.
The Block Control Block Control may represent 8 (2)3) Encoding mode is adopted. When the Block Control is 000, the Encoding mode is a Block Bitmap.
The Block Offset may Offset the start station from 0 to k, k being 0-32 (2)5). For example, station1, station6, station 21, and station 23 access the channel within a restricted access window RAW, the smallest station is station1, and the Block Offset can be selected to be 0 or 1; if the station 21 and the station 23 access the channel within the restricted access window RAW, the smallest station is the station 21 and the Block Offset can be selected 21.
When the values of the Page Index and the Page Slice Number are determined, the value of the highest 7 bits (B01-B07) of the association identifier AID of the station STA accessing the channel within the restricted access window RAW is determined. For example, when the Page Index is 00 and the Page Slice Number is 00000, the highest 7 bits B01B02B03B04B05B06B07 of the association identifier AID of the station STA accessing the channel in the restricted access window RAW are 0000000, and the association identifier AID of the station STA connected to the connection point AP in the restricted access window RAW can be known only by determining the value of the six bits after the association identifier AID.
As shown in fig. 5, the Encoded Block Information in the prior art includes 1 row and 8 columns of Block Bitmap and N rows and 8 columns of Sub-blocks Sub _ Block, where N is an integer and N is greater than or equal to 1 and less than or equal to 8; the Block Bitmap includes 8 Sub-blocks Sub _ Block: n numbers of SB01, SB02, SB03, SB04, SB05, SB06, SB07, and SB08, SB01, SB02, SB03, SB04, SB05, SB06, SB07, and SB08 are 1; the Sub-Block Sub _ Block of the N rows and 8 columns comprises an nth Sub-Block Sub _ Block N … … of a first Sub-Block Sub _ Block1 … …, wherein N is an integer and is more than or equal to 1 and less than or equal to N; the first Sub-Block Sub _ Block1 comprises 8 stations STA: s11, S12, S13, S14, S15, S16, S17, and S18; the nth Sub-block Sub _ Blockn includes 8 stations STA: sn1, Sn2, Sn3, Sn4, Sn5, Sn6, Sn7, and Sn 8; the nth Sub-Block Sub _ Block N includes 8 stations: SN1, SN2, SN3, SN4, SN5, SN6, SN7, and SN 8; when SB0k is 0, 8 stations corresponding to SB0k do not access the channel within the restricted access window RAW, and the coded Block Information encodes no 8 stations of SB0k, i.e., the Sub-Block Sub _ Block does not include 8 stations corresponding to SB0k (k is 1,2,3,4,5,6,7, 8); when SB0k is 1, the coded Block Information encodes 8 stations of SB0k, i.e., 8 stations of which Sub-Block Sub _ Block includes SB0 k; when Sij in the Sub-Block Sub _ Block is 1, the jth station Sij of the ith Sub-Block Sub _ Block i accesses the channel within the restricted access window RAW; when Sij in the Sub-Block Sub _ Block is 0, the jth station Sij of the ith Sub-Block Sub _ Block i does not access the channel within the restricted access window RAW (i ≦ 1 ≦ N, j ≦ 1,2,3,4,5,6,7, 8).
As shown in fig. 6, station1 (association identifier AID 0000000000001), station6 (association identifier AID 0000000000110), station 21 (association identifier AID 0000000010101), and station 23 (association identifier AID 0000000010111) access channels within a restricted access window RAW; station1 is the 2 nd Station2 of the 1 st Sub-Block Sub 1 of the 1 st Page Slice1 of the 1 st Page1, Station6 is the 7 th Station7 of the 1 st Sub-Block Sub 1 of the 1 st Page Slice1 of the 1 st Page1, Station 21 is the 6 th Station6 of the 3 rd Sub-Block Sub 3 of the 1 st Page Slice1 of the 1 st Page1, Station 23 is the 8 th Station8 of the 3 rd Sub-Block Sub 3 of the 1 st Page Slice1 of the 1 st Page 1; setting a Page Index Page Index in the Bitmap Control to 00, and setting a Page Slice Number to 00000; the coded Block Information Encoded Block Information consists of a Block Bitmap, a first Sub-Block 1 and a second Sub-Block 2; setting SB01 and SB03 in the Block Bitmap to 1, and setting the rest to 0; s12 and S17 in the first Sub-Block 1 are set to 1, and the rest are set to 0; s26 and S28 in the second Sub-Block Sub _ Block2 are set to 1; the traffic indication information TIM indicates association identifiers AID of stations STA of the RAW access channel in the restricted access window are 0000000000001, 0000000000110, 0000000010101 and 0000000010111, respectively.
As shown in fig. 7, the restricted access window parameter set information Element RPS in the prior art includes an Element identifier Element ID, a Length, a restricted access window Control RAW Control, a restricted access window Slot Definition RAW Slot, a restricted access window Start Time RAW Start Time, a restricted access window Group RAW Group, a Channel Indication, and a Periodic Operation parameter Periodic Operation Parameters; the restricted access window Slot Definition RAW Slot Definition includes a one-bit Slot Definition Format indication, a one-bit Cross Slot Boundary Cross Slot Boundary, and a y-bit Slot Duration Count (hereinafter abbreviated as C)SLOT) And (14-y) bit Number of slots of Slot (abbreviated as N hereinafter)SLOT) And y is 8 or 11.
When the Slot Definition Format indicates that Slot Definition Format indication is 0, y is 8, 14-y is 6, and Slot interval count C is setSLOTCan be 0-256 (2)8) Number of time slots NSLOTCan be 0-64 (2)6) (ii) a When the Slot Definition Format indicates that Slot Definition Format indication is 1, y is 11, 14-y is 3, and the Slot interval count C is setSLOTCan be that0-2048(211) Number of time slots NSLOTCan be 0-8 (2)3)。
Slot Duration (hereinafter abbreviated as D)SLOT)＝500+CSLOT120, restricted access window length RAW Duration (hereinafter abbreviated as D)RAW)＝DSLOT*NSLOT＝(500+CSLOT*120)*NSLOT。
Time slot length D of access channel of different station STA in limited access window RAW in prior artSLOTAre equal (both are (500+ C)SLOT*120)*NSLOT) Resulting in that the time allocated to some station STAs exceeds the time required by the station STA, resulting in a waste of time, while the time allocated to some station STAs is shorter than the time required by the station STA, resulting in that the station STA cannot complete the transmission of the entire data.
All the contents of the invention
The invention aims to provide a method for dynamically allocating the time slot length of a limited access window in a wireless network, which allocates different time slot lengths to stations requiring different time slot lengths.
The invention is realized by the following technical scheme:
a method for dynamically allocating a slot length of a restricted access window in a wireless network, comprising the steps of:
step 1, an access point AP calculates the time slot length required by a jth station Sij of an ith Sub-Block Sub _ Block i, wherein the jth station Sij of the ith Sub-Block Sub _ Block i accesses a channel in a restricted access window RAW, i and j are integers, i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to 8, and N is the number of Sub-blocks Sub _ Block accessing the channel in the restricted access window RAW; step 2, the access point AP obtains a Slot grade table Slot Scale according to the time Slot lengths needed by all stations accessing the channel in the restricted access window RAW; and 3, the access point AP loads the Slot level table Slot Scale in the frame body of the beacon frame.
Further, the step 1 comprises the following steps: step 11, the access point AP calculates the transmission time Tij needed by the jth station Sij of the ith Sub-Block Sub _ Block i in the coded Block Information; step 12, the access point AP performs the algorithm DSLOTij＝(Tij/Ttotal)*DRAWCalculating the time slot length D needed by the jth station Sij of the ith Sub-block Sub _ Block iSLOTijWherein D isRAW＝DSLOT*NSLOT＝(500+CSLOT*120)*NSLOTTtotal is the sum of the transmission times required by all stations STA accessing the channel within a restricted access window RAW, CSLOTCounting the slot intervals, DSLOTIs the length of the time slot, NSLOTIs the number of time slots, DRAWIs the limited access window length.
Further, the step 11 includes the steps of: step 111, the access point AP counts the data length L _ dataij, the bandwidth Band _ width and the modulation mode MCSij that the jth station Sij of the ith Sub-block Sub _ block i needs to transmit; step 112, the access point AP obtains the bit number N _ dataij transmitted by each signal Symbol according to the bandwidth Band _ width of the i-th Sub-block Sub _ Blocki and the modulation mode MCSij; in step 113, the AP calculates a transmission time Tij required by the jth station Sij of the ith Sub-block Sub _ block i according to the algorithm Tij ═ L _ dataij/N _ dataij × 40.
As a specific implementation, the number of bits N _ data transmitted by each signal Symbol, the bandwidth Band _ width, and the modulation scheme MCSij are set according to the following table:
Figure GDA0003380199730000051
that is, when the bandwidth Band _ width is 1MHZ and the modulation scheme MCSij is 0, the number of bits N _ dataij transmitted per signal Symbol is 12; when the bandwidth Band _ width is 1MHZ, and the modulation mode MCSij is 1, the number of bits N _ dataij transmitted by each signal Symbol is 24; when the bandwidth Band _ width is 1MHZ, and the modulation mode MCSij is 2, the number of bits N _ dataij transmitted by each signal Symbol is 36; when the bandwidth Band _ width is 1MHZ, and the modulation mode MCSij is 3, the number of bits N _ dataij transmitted by each signal Symbol is 48; when the bandwidth Band _ width is 2MHZ and the modulation mode MCSij is 0, the number of bits N _ dataij transmitted by each signal Symbol is 26; when the bandwidth Band _ width is 2MHZ and the modulation mode MCSij is 1, the number of bits N _ dataij transmitted by each signal Symbol is 52; when the bandwidth Band _ width is 2MHZ and the modulation mode MCSij is 2, the number of bits N _ dataij transmitted by each signal Symbol is 78; when the bandwidth Band _ width is 2MHZ and the modulation mode MCSij is 3, the number of bits N _ dataij transmitted by each signal Symbol is 104;
when the bandwidth Band _ width is 4MHZ and the modulation scheme MCSij is 0, the number of bits N _ dataij transmitted by each signal Symbol is 54; when the bandwidth Band _ width is 4MHZ and the modulation mode MCSij is 1, the number of bits N _ dataij transmitted by each signal Symbol is 108; when the bandwidth Band _ width is 4MHZ and the modulation mode MCSij is 2, the number of bits N _ dataij transmitted by each signal Symbol is 162; when the bandwidth Band _ width is 4MHZ and the modulation mode MCSij is 3, the number of bits N _ dataij transmitted by each signal Symbol is 216; when the bandwidth Band _ width is 8MHZ and the modulation scheme MCSij is 0, the number of bits N _ dataij transmitted by each signal Symbol is 117; when the bandwidth Band _ width is 8MHZ and the modulation scheme MCSij is 1, the number of bits N _ dataij transmitted by each signal Symbol is 234; when the bandwidth Band _ width is 8MHZ and the modulation scheme MCSij is 2, the number of bits N _ dataij transmitted by each signal Symbol is 351; when the bandwidth Band _ width is 8MHZ and the modulation scheme MCSij is 3, the number of bits N _ dataij transmitted per signal Symbol is 468.
Further, the step 111 actively queries the jth station Sij of the ith Sub-block Sub _ Blocki for the access point AP to obtain the data length L _ dataij, the bandwidth Band _ width and the modulation mode MCSij that the jth station Sij of the ith Sub-block Sub _ Blocki needs to transmit, or the step 111 actively feeds back the data length L _ dataij, the bandwidth Band _ width and the modulation mode MCSij that need to transmit to the access point AP for the jth station Sij of the ith Sub-block Sub _ Blocki.
Further, the step 2 comprises the following steps: step 21, the access point AP sets D according to the algorithm SMij ═ DSLOTij/DSLOTCalculating the time slot length D needed by the jth station Sij of the ith Sub-block Sub _ Block iSLOTijAnd the slot length DSLOTThe ratio of (SMij); step 22, the access point AP expresses a ratio SMij of a jth station Sij of the ith Sub-block Sub _ Blocki by eight bits; in step 23, the access point AP composes all STA ratios accessing the channel in the restricted access window RAW into a Slot level table Slot Scale.
Further, the Slot level table Slot Scale further includes association identifiers AID of stations STA accessing channels within the restricted access window RAW, which are expressed by 16 bits, one association identifier AID corresponding to one ratio.
As a Specific implementation manner, step 3 is that the access point AP carries the Slot level table Slot Scale in the traffic indication information TIM, or step 3 is that the access point AP carries the Slot level table Slot Scale in the restricted access window parameter set information element RPS, or step 3 is that the access point AP carries the Slot level table Slot Scale in the manufacturer defined Vendor Specific.
The invention has the beneficial effects that:
the invention can indicate the time Slot length needed by all stations accessing the channel in the restricted access window RAW by bearing the time Slot grade table Slot Scale in the beacon frame, so that different stations can allocate different time Slot lengths.
Description of the drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. The drawings in the following description are only embodiments of the invention and other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
FIG. 1 is a block diagram of a prior art association identifier AID;
FIG. 2 is a block diagram of a prior art association identifier AID;
fig. 3 is a block diagram of a prior art beacon frame structure;
fig. 4 is a block diagram of a prior art traffic indication information TIM frame structure;
FIG. 5 is a Block diagram of a prior art Encoded Block Information;
fig. 6 is a Block diagram of coded Block Information of the prior art station1, station6, station 21, and station 23 when accessing a channel within a restricted access window RAW
Fig. 7 is a block diagram of a prior art restricted access window parameter set information element RPS frame structure;
FIG. 8 is a block diagram of a prior art manufacturer defined Vendor Specific frame structure;
fig. 9 is a block diagram of a traffic indication TIM frame structure according to an embodiment of the present invention;
fig. 10 is a structural diagram of coded Block Information and Slot Scale of Slot table according to an embodiment of the present invention;
fig. 11 is a structural diagram of coded Block Information and Slot level table Slot Scale when station1, station6, station 21, and station 23 access a channel within a restricted access window RAW according to an embodiment of the present invention;
fig. 12 is a block diagram of a second embodiment of the present invention, a restricted access window parameter set information element RPS frame structure;
FIG. 13 is a block diagram of a Vendor defined Vendor Specific frame structure according to an embodiment of the present invention;
FIG. 14 is a block diagram of a four Slot level table Slot Scale according to an embodiment of the present invention;
fig. 15 is a structural diagram of a Slot level table Slot Scale when four stations 1, 6, 21 and 23 access channels within a restricted access window RAW according to an embodiment of the present invention.
(specific embodiments) in all cases
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for dynamically adjusting the length of a time slot in a restricted access window in a wireless network comprising the steps of:
step 1, an access point AP calculates the time slot length required by the jth station Sij of the ith Sub-block Sub _ Block i, the jth station Sij of the ith Sub-block Sub _ Block i accesses a channel in a restricted access window RAW, i and j are integers, i is more than or equal to 1 and less than or equal to N, and j is more than or equal to 1 and less than or equal to 8; step 2, the access point AP obtains a Slot grade table Slot Scale representing the Slot lengths of different stations STA according to the Slot lengths required by the different stations STA; and 3, the access point AP loads the Slot level table Slot Scale in the frame body of the beacon frame.
Step 1 comprises the following steps; 11, the access point AP calculates the transmission time Tij required by the jth station Sij of the ith Sub-Block Sub _ Block i in the coded Block Information; 12, access point AP according to algorithm DSLOTij＝(Tij/Ttotal)*DRAWCalculating the time slot length D needed by the jth station Sij of the ith Sub-block Sub _ Block iSLOTij＝(Tij/Ttotal)*DSLOT*NSLOT＝(Tij/Ttotal)*(500+CSLOT*120)*NSLOTThe transmission time required by the jth station Sij of the ith Sub-block Sub _ Blocki of Tij, Ttotal being the sum of the transmission times required by all stations STA accessing the channel within the restricted access window RAW, CSLOTCounting the slot intervals, DSLOTIs the length of the time slot, NSLOTIs the number of time slots, DRAWIs the limited access window length.
Step 11 comprises the following steps: 111, the access point AP counts the length L _ dataij of data to be transmitted by the jth station Sij of the ith Sub-block Sub _ Blocki, the bandwidth Band _ width and the modulation mode MCSij; 112, the access point AP obtains the bit number N _ dataij transmitted by each signal Symbol according to the bandwidth Band _ width of the i-th Sub-block Sub _ Blocki and the modulation mode MCSij; the AP calculates a transmission time Tij required by the j-th station Sij of the i-th Sub-block Sub _ block i according to the algorithm Tij ═ (L _ dataij/N _ dataij) × 40.
In step 11, N _ dataij is the number of bits transmitted per signal Symbol (Symbol is 40us in length) in the jth station Sij of the ith Sub-block Sub _ Blocki.
In this embodiment, the number of bits N _ data transmitted per Symbol is related to the bandwidth Band _ width of the data and the modulation scheme MCS, and the specific relationship between N _ data and f (Band _ width, MCS) is shown in table 1 below.
Figure GDA0003380199730000091
Table 1: the relation table of the bit number N _ data transmitted by the signal Symbol, the bandwidth Band _ width of the data and the modulation scheme MCS.
As shown in table 1, in step 11, after the AP counts the bandwidth Band _ width and the modulation scheme MCSij of the jth station Sij of the ith Sub-block Sub _ block i, the bit number N _ dataij transmitted by each signal Symbol in the jth station Sij of the ith Sub-block Sub _ block i is obtained.
In this embodiment, in step 111, the access point AP actively queries the jth station Sij of the ith Sub-block Sub _ Blocki to obtain the length L _ dataij, the bandwidth Band _ width j, and the modulation mode MCSij of data that needs to be transmitted by the jth station Sij of the ith Sub-block Sub _ Blocki.
In other embodiments, the jth station Sij of the ith Sub-block Sub _ Blocki actively feeds back the data length L _ dataij, the bandwidth Band _ width, and the modulation mode MCSij to the access point AP.
Step 2 comprises the step of, 21, the access point AP according to the algorithm SMij ═ DSLOTij/DSLOTCalculating the time slot length D needed by the jth station Sij of the ith Sub-block Sub _ Block iSLOTijRatio to time slot length SMij ═ (Tij/Ttotal) × NSLOT(ii) a 22, expressing the ratio value SMij corresponding to the jth station Sij of the ith Sub-block Sub _ Block i by eight bits; and 23, forming a Slot level table Slot Scale according to the ratio SM of all stations accessing the channel in the restricted access window RAW.
In step 21, the required slot length D of the jth station Sij of the ith Sub-block Sub _ BlockiSLOTij＝(Tij/Ttotal)*NSLOT*DSLOT，SMij＝DSLOTij/DSLOT＝(Tij/Ttotal)*NSLOTI.e. the length D of the slot required by the jth station Sij of the ith Sub-block Sub _ block iSLOTijIs the slot length DSLOTSMij times higher.
As shown in fig. 9, in this embodiment, the Slot level table Slot Scale is carried in the traffic indication information TIM, that is, step 3 is that the access point AP carries the Slot level table Slot Scale in the traffic indication information TIM; as shown in fig. 10, the Slot level table Slot Scale is composed of M rows and 8 columns (indicating that there are M stations STA accessing channels in the restricted access window RAW in total), and includes Slot Scale1 … … Slot Scale … … Slot Scale em, where M is the number of stations STA accessing channels in the restricted access window RAW, Slot Scale1 is the ratio of the first station STA1 expressed in eight bits, Slot Scale em is the ratio of the nth station STA expressed in eight bits, and Slot Scale em is the ratio of the mth station STA expressed in eight bits.
As shown in fig. 11, station1 (association identifier AID 0000000000001), station6 (association identifier AID 0000000000110), station 21 (association identifier AID 0000000010101), and station 23 (association identifier AID 0000000010111) access channels within a restricted access window RAW; block Bitmap is 10100000; sub _ Block1 ═ 01000010, Sub _ Block2 ═ 00000101; the Slot Scale table Slot Scale is composed of 4 rows and 8 columns, and comprises Slot Scale1, Slot Scale2, Slot Scale3 and Slot Scale4, wherein Slot Scale1 is 01110000, Slot Scale2 is 10111000, Slot Scale3 is 00101101, and Slot Scale4 is 11001010; the ratio SM12 for station1 is (2)1+22+24) 14, i.e. the length of the time slot D required by the station1SLOT12Is the time slot length DSLOT14 times of, the length D of the time slot required by the station1SLOT12＝14*(500+CSLOT120); the ratio SM17 for station2 is (2)0+22+23+24) 29, i.e. the length D of the time slot required by the station6SLOT17Is the time slot length DSLOT29 times the length D of the time slot required by the station6SLOT12＝29*(500+CSLOT120); the ratio SM26 for station 21 is (2)2+24+25+27) 180, i.e. the length D of the time slot required by the station 23SLOT26Is the time slot length DSLOT180 times the length D of the time slot required by the station 23SLOT26＝180*(500+CSLOT120); the station 23 corresponds to a ratio SM28 of 83, i.e. the length D of the time slot required by the station 23SLOT28Is the time slot length DSLOT83 times, the length of the time slot D required by the station 23SLOT28＝83*(500+CSLOT*120)。
After all the stations STA receive the beacon frame, decoding Encoded Block Information in the traffic indication Information TIM to obtain access channels of the stations 1, 6, 21 and 23 in a restricted access window RAW, and then obtaining the time Slot lengths required by the stations 1, 6, 21 and 23 according to a time Slot level table Slot Scale; station1, station6, station 21, and station 23 access the channel within the respective slot lengths.
Example 2
As shown in fig. 12, the present embodiment is different from the first embodiment in that: the Slot level table Slot Scale is carried in the restricted access window parameter set information element RPS.
Example 3
As shown in fig. 13, the present embodiment is different from the first embodiment in that: the Slot Scale table Slot Scale carries a Vendor-Specific content in a Vendor-defined Vendor Specific.
Example 4
As shown in fig. 14, the present embodiment is different from the first embodiment in that: the Slot level table Slot Scale also includes an association identifier AID of a station STA accessing the channel within the restricted access window RAW, expressed in 16 bits; one association identifier AID corresponds to one ratio, so that each station STA accessing a channel in the restricted access window RAW can be guaranteed to have a corresponding ratio, and when the station STA receives a beacon frame transmitted by the access point AP, the association identifier AID and the ratio can be read in sequence.
In the present embodiment, each AID address is represented by 2 rows and 8 columns; the first 3 bits are always 0, the last 13 bits represent the association identifier AID, or the first 13 bits represent the association identifier AID, and the last 3 bits are always 0.
As shown in fig. 15, station1 (association identifier AID 0000000000001), station6 (association identifier AID 0000000000110), station 21 (association identifier AID 0000000010101), and station 23 (association identifier AID 0000000010111) access channels within a restricted access window RAW; block Bitmap is 10100000; sub _ Block1 ═ 01000010, Sub _ Block2 ═ 00000101; the Slot Scale table Slot Scale is composed of 12 rows and 8 columns and comprises AID1, Slot Scale1, AID2, Slot Scale2, AID3, Slot Scale3, AID4 and Slot Scale4, AID1 is 0000000000000001, Slot Scale1 is 01110000, AID2 is 0000000000000110, Slot Scale2 is 10111000, AID3 is 0000000000010101, Slot Scale3 is 00101, AID4 is 0000000000010111, and Slot Scale4 is 11001010.
In the present embodiment, the ratio SM12 for station1 is (2)1+22+24) 14, i.e. the length of the time slot D required by the station1SLOT12Is the time slot length D SLOT14 times of, the length D of the time slot required by the station1SLOT12＝14*(500+CSLOT120); the ratio SM17 for station2 is (2)0+22+23+24) 29, i.e. the length D of the time slot required by the station6SLOT17Is the time slot length DSLOT29 times the length D of the time slot required by the station6SLOT12＝29*(500+CSLOT120); the ratio SM26 for station 21 is (2)2+24+25+27) 180, i.e. the length D of the time slot required by the station 23SLOT26Is the time slot length DSLOT180 times the length D of the time slot required by the station 23SLOT26＝180*(500+CSLOT120); the station 23 corresponds to a ratio SM28 of 83, i.e. the length D of the time slot required by the station 23SLOT28Is the time slot length DSLOT83 times, the length of the time slot D required by the station 23SLOT28＝83*(500+CSLOT*120)。
Example 5
The difference between this embodiment and the second embodiment is: the Slot Scale table Slot Scale further includes an AID address of a station STA accessing a channel within the restricted access window RAW, which is expressed by 16 bits; one AID address corresponds to one ratio.
In the present embodiment, each AID address is represented by 2 rows and 8 columns.
Example 6
The difference between this embodiment and the third embodiment is that: the Slot Scale table Slot Scale further includes an AID address of a station STA accessing a channel within the restricted access window RAW, which is expressed by 16 bits; one AID address corresponds to one ratio.
In the present embodiment, each AID address is represented by 2 rows and 8 columns.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (8)

1. A method for dynamically allocating a slot length of a restricted access window in a wireless network, comprising the steps of: step 1, an access point AP calculates the time slot length required by a jth station Sij of an ith Sub-Block Sub _ Block i, wherein the jth station Sij of the ith Sub-Block Sub _ Block i accesses a channel in a restricted access window RAW, i and j are integers, i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to 8, and N is the number of Sub-blocks Sub _ Block accessing the channel in the restricted access window RAW; step 2, the access point AP obtains a Slot grade table Slot Scale according to the time Slot lengths needed by all stations accessing the channel in the restricted access window RAW; and 3, the access point AP loads the Slot level table Slot Scale in the frame body of the beacon frame.
2. The method for dynamically allocating slot length of a restricted access window in a wireless network as claimed in claim 1, wherein said step 1 comprises the steps of: step 11, the access point AP calculates the transmission time Tij needed by the jth station Sij of the ith Sub-Block Sub _ Block i in the coded Block Information; step 12, the access point AP performs the algorithm DSLOTij＝(Tij/Ttotal)*DRAWCalculating the time slot length D needed by the jth station Sij of the ith Sub-block Sub _ Block iSLOTijWherein D isRAW＝DSLOT*NSLOT＝(500+CSLOT*120)*NSLOTTtotal is the sum of the transmission times required by all stations STA accessing the channel within a restricted access window RAW, CSLOTCounting the slot intervals, DSLOTIs the length of the time slot, NSLOTIs the number of time slots, DRAWIs the limited access window length.
3. The method for dynamically allocating slot length of restricted access window in wireless network as claimed in claim 2, wherein said step 11 comprises the steps of: step 111, the access point AP counts the data length L _ dataij, the bandwidth Band _ width and the modulation mode MCSij that the jth station Sij of the ith Sub-block Sub _ block i needs to transmit; step 112, the access point AP obtains the bit number N _ dataij transmitted by each signal Symbol according to the bandwidth Band _ width of the i-th Sub-block Sub _ Blocki and the modulation mode MCSij; in step 113, the AP calculates a transmission time Tij required by the jth station Sij of the ith Sub-block Sub _ block i according to the algorithm Tij ═ L _ dataij/N _ dataij × 40.
4. The method of dynamically allocating slot lengths for a restricted access window in a wireless network as recited in claim 3, wherein: the number of bits N _ data transmitted by each signal Symbol, the bandwidth Band _ width, and the modulation scheme MCSij are set as follows:
Figure FDA0003380199720000021
5. the method of dynamically allocating slot lengths for a restricted access window in a wireless network as recited in claim 3, wherein: the step 111 is that the access point AP actively queries the jth station Sij of the ith Sub-block Sub _ block i to obtain the data length L _ dataij, the bandwidth Band _ width and the modulation mode MCSij that the jth station Sij of the ith Sub-block Sub _ block i needs to transmit, or the step 111 is that the jth station Sij of the ith Sub-block Sub _ block actively feeds back the data length L _ dataij, the bandwidth Band _ width and the modulation mode MCSij that need to transmit to the access point AP.
6. The method for dynamically allocating slot length of a restricted access window in a wireless network as claimed in claim 1, wherein said step 2 comprises the steps of: step 21, the access point AP sets D according to the algorithm SMij ═ DSLOTij/DSLOTCalculating the time slot length D needed by the jth station Sij of the ith Sub-block Sub _ Block iSLOTijAnd the slot length DSLOTThe ratio of (SMij); step 22, the access point AP expresses a ratio SMij of a jth station Sij of the ith Sub-block Sub _ Blocki by eight bits; in step 23, the access point AP composes all STA ratios accessing the channel in the restricted access window RAW into a Slot level table Slot Scale.
7. The method of dynamically allocating slot lengths of a restricted access window in a wireless network as recited in claim 6, wherein; the Slot level table Slot Scale further includes association identifiers AID of stations STA accessing the channel within the restricted access window RAW, which are expressed by 16 bits, one association identifier AID corresponding to one ratio.
8. The method of claim 1, wherein step 3 is for the AP to carry the Slot level table Slot Scale in the traffic indication information TIM, or wherein step 3 is for the AP to carry the Slot level table Slot Scale in the restricted Access Window parameter set information element RPS, or wherein step 3 is for the AP to carry the Slot level table Slot Scale in the manufacturer defined Vendor Specific.
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