WO2016122361A1 - Procédé et nœud de réseau destinés à améliorer l'utilisation de ressources radio dans un réseau de communication sans fil - Google Patents

Procédé et nœud de réseau destinés à améliorer l'utilisation de ressources radio dans un réseau de communication sans fil Download PDF

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Publication number
WO2016122361A1
WO2016122361A1 PCT/SE2015/050088 SE2015050088W WO2016122361A1 WO 2016122361 A1 WO2016122361 A1 WO 2016122361A1 SE 2015050088 W SE2015050088 W SE 2015050088W WO 2016122361 A1 WO2016122361 A1 WO 2016122361A1
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Prior art keywords
network node
mobile stations
time need
amount
communicate
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PCT/SE2015/050088
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English (en)
Inventor
Parth AMIN
Luis Felipe DEL CARPIO VEGA
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Telefonaktiebolaget Lm Ericsson (Publ)
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Priority to PCT/SE2015/050088 priority Critical patent/WO2016122361A1/fr
Publication of WO2016122361A1 publication Critical patent/WO2016122361A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present disclosure relates generally to a method, a network node and a computer program for improving radio resource utilization in a wireless communication network. More specifically, it relates to improving radio resource utilization of radio resources provided by a base station.
  • Wireless communication is constantly increasing in the world today. Efficient usage of communication resources is a hot topic in any type of wireless communication network, such as different 3GPP defined access technology networks, e.g. Universal Mobile Telecommunication System, UMTS, UMTS Terrestrial Radio Access Network, UTRAN, evolved UTRAN, E-UTRAN, GSM Edge Radio Access Network, GERAN and other wireless networks such as Wireless Local Area Networks, WLAN, Bluetooth and networks based on IEEE 802.15.
  • 3GPP defined access technology networks e.g. Universal Mobile Telecommunication System, UMTS, UMTS Terrestrial Radio Access Network, UTRAN, evolved UTRAN, E-UTRAN, GSM Edge Radio Access Network, GERAN and other wireless networks such as Wireless Local Area Networks, WLAN, Bluetooth and networks based on IEEE 802.15.
  • 3GPP defined access technology networks e.g. Universal Mobile Telecommunication System, UMTS, UMTS Terrestrial Radio Access Network, UTRAN, evolved UTRAN, E-UTRAN, GSM Edge Radio Access Network, GERAN
  • M2M Machine-to-Machine
  • a method is provided performed by a network node in a wireless communication network, for improving radio resource utilization.
  • the method comprises obtaining, for each of a plurality of mobile stations wirelessly connected to the network node, a channel quality describing a quality of a radio channel connecting the one of the plurality of mobile stations to the network node, a channel bandwidth of the radio channel connecting the one of the plurality of mobile stations to the network node, and a measure of an amount of data to communicate between the one of the plurality of mobile stations and the network node.
  • the method further comprises determining a communication time need for each of the plurality of mobile stations based on the obtained channel quality, the obtained channel bandwidth and the obtained measure of amount of data to communicate for each respective mobile station, grouping the plurality of mobile stations into one or more subgroups based on their respective determined communication time need, and allocating transmission time to each of the one or more subgroups based on the determined time need.
  • the transmission resources of the base station are better utilized. Further, especially for M2M communication where there may be a large number of mobile stations such as sensor devices connected to one base station, such a grouping
  • a network node operable in a wireless communication network, for improving radio resource utilization.
  • the network node comprises a processor and a memory, said memory containing instructions executable by said processor, whereby the network node is operative for obtaining, for each of a plurality of mobile stations wirelessly connected to the network node, a channel quality describing a quality of a radio channel connecting the one of the plurality of mobile stations to the network node, a channel bandwidth of the radio channel connecting the one of the plurality of mobile stations to the network node, and a measure of an amount of data to communicate between the one of the plurality of mobile stations and the network node.
  • the memory further contains instructions executable by said processor, whereby the network node is operative for determining a communication time need for each of the plurality of mobile stations based on the obtained channel quality, the obtained channel bandwidth and the obtained measure of amount of data to communicate for each respective mobile station, grouping the plurality of mobile stations into one or more subgroups based on their respective determined communication time need, and allocating transmission time to each of the one or more subgroups based on the determined time need.
  • FIG. 1 is a communication scenario illustrating a part of a wireless communication network in which embodiments of the present invention may be used.
  • Figs. 2-4 are flow charts illustrating methods performed by a network node, according to possible embodiments.
  • Fig. 5 is a diagram showing grouping of mobile stations based on their individual communication time need.
  • FIGs. 6-7 are block diagrams illustrating a network node in more detail, according to further possible embodiments.
  • a solution is provided to be able to better utilize radio resources of a base station to which a plurality of mobile stations are connected. This is achieved by the base station grouping the mobile stations into different groups based on a determined communication need for each individual mobile station, and allocating time resources for the mobile stations of each group based on the determined communication need.
  • the communication need for individual mobile stations is determined based on the channel bandwidth for the individual mobile station, the channel quality of the individual mobile station and the amount of data to communicate between the individual mobile station and the base station.
  • Fig. 1 describes a wireless communication network 100 in which embodiments of the present invention may be used.
  • the wireless communication network 100 comprises a base station 120 and a plurality of mobile stations 101 , 102, 103 that each has a radio connection with the base station 120.
  • the wireless communication network may be any type of wireless access network, such as the UTRAN, E-UTRAN, GERAN, WLAN, Bluetooth or networks based on IEEE 802.15.
  • the base station 120 may be any type of network node providing wireless access to mobile stations, such as a Base Transceiver
  • the mobile station may be any kind of mobile communication device enabled for wireless communication in a wireless
  • a communication network such as a mobile phone, a laptop, a User Equipment as defined in 3GPP, a station, STA as defined in the IEEE.
  • Fig. 2 shows a method performed by a network node 120 in a wireless communication network 100, for improving radio resource utilization. Dashed lines of some boxes in Fig. 2 indicate that the corresponding action is not mandatory.
  • the method comprises obtaining 202, for each of a plurality of mobile stations 101 , 102, 103 wirelessly connected to the network node 120, a channel quality describing a quality of a radio channel connecting the one of the plurality of mobile stations to the network node, a channel bandwidth of the radio channel
  • the method further comprises determining 208 a communication time need for each of the plurality of mobile stations based on the obtained channel quality, the obtained channel bandwidth and the obtained measure of amount of data to communicate for each respective mobile station, grouping 210 the plurality of mobile stations into one or more subgroups based on their respective determined communication time need, and allocating 214 transmission time to each of the one or more subgroups based on the determined time need.
  • the wireless communication network 100 may be an IEEE based network such as a Wi-Fi network or a 3GPP based network such as a GERAN, UTRAN or e-UTRAN, or any other access technology based network.
  • the wireless communication network may be adapted for machine to machine communication.
  • the wireless communication network may be a wireless local area network, WLAN, using the IEEE 802.1 1 standard or an amendment such as 802.1 1 ah.
  • the network node may be e.g. a base station of a 3GPP based network or an access point, AP of a WLAN, but also a two-hop relay situated between an AP or base station and a plurality of mobile stations for relaying signals between mobile stations situated on e.g.
  • the two-hop relay may have two parts, one part working as a relay between the network node and other mobile stations, and one regular mobile station part.
  • the channel quality may be for example Signal to Noise Ratio, SNR, signal to interference ratio, SIR, signal to noise and interference ration, SINR, or modulation and coding scheme, MCS.
  • the channel bandwidth may be the current bandwidth used by the mobile station.
  • the measure of the amount of data to communicate between the mobile station and the network node may be e.g. a size of a file to transmit.
  • a communication time need is a time needed for communicating the amount of data over the channel between the individual mobile station and the network node.
  • the communication may be in either uplink, i.e. from mobile station to network node or in downlink, i.e. from network node to mobile station.
  • At least one of the channel quality, the channel bandwidth and the amount of data to communicate may be weighted differently than the other two. This feature makes it possible to prioritize one or two of channel quality, channel bandwidth and amount of data over the other(s). For example, if the channel quality is considered to be more important when it comes to allocating transmission time, it may be weighted higher than the channel bandwidth and the amount of data to communicate.
  • the method may further comprise determining 212 an average communication time need for the mobile stations grouped into one subgroup based on the determined 208 individual time need for each mobile station in that subgroup, and wherein the allocation 214 may be performed based on the determined average communication time need.
  • Such an average time need results in a more accurate allocation of transmission time. For example, if two groups have similar average communication time need they may receive similar time allocations. On the other hand, if two groups have large differences in their average communication time need they will receive time allocation proportional to their average communication time need.
  • the method further comprises obtaining 302, for at least one of the plurality of mobile stations, an updated value for any of the channel quality, the channel bandwidth and the amount of data to communicate, the updated value being different from the already obtained channel quality, channel bandwidth or amount of data to communicate.
  • the method may further comprise re-determining 304, for the at least one of the plurality of mobile stations, the time need based on the updated value and the of the channel quality, the channel bandwidth and the amount of data to communicate for the at least one of the plurality of mobile stations for which no updated value has been obtained.
  • the method may comprise regrouping 306 the plurality of mobile stations into subgroups based on the redetermined time need; and reallocating 308 transmission time to each subgroup based on the re-determined time need.
  • the utilization of the radio resources are kept on a high, efficient level even when the conditions changes.
  • reallocating 308 are only performed when a certain amount of values of the channel quality, the channel bandwidth and/or the amount of data to communicate have been updated. Thereby, processing power is saved.
  • the certain amount of values may be a certain percentage of all values of the channel quality, the channel bandwidth and/or the amount of data to communicate for all mobile stations connected to a network node.
  • the values of channel quality, channel bandwidth and amount of data to communicate may have to change by at least a certain percentage or absolute value to be detected as a change that may lead to regrouping and reallocating.
  • the base station 120 is a WLAN access point and the mobile stations 101 , 102, 103 are machines or other non-human devices that are equipped with wireless communication capabilities, such as wireless sensor devices.
  • 802.1 1 ah There is an emerging IEEE standard 802.1 1 ah that addresses the need for a machine-to-machine, M2M, wireless standard that covers an existing gap between traditional wireless communication networks such as a network built on the 3GPP LTE standard, and the growing demand for wireless sensor networks.
  • 802.1 1 ah deals with the specification of an unlicensed sub-1 GHz worldwide WLAN for future M2M communications supporting a wide set of scenarios based on a large number of devices, a long range and energy constraints.
  • the IEEE 802.1 1 ah offers a simple, robust and efficient solution in the Industrial Scientific and Medical, ISM, band.
  • An IEEE 802.1 1 ah access point, AP is required to support up to 8191 mobile stations, called STAs in the 802.1 1 ah, through a hierarchical identifier structure along with power saving mechanisms for the STAs.
  • the 802.1 1 ah standard defines two different types of STAs, each with different procedures and time period to access the common channel. The different types are:
  • Traffic indication map which is a type of STA that needs to listen to AP beacons to receive data. Their data transmissions may be performed within a restricted access window, RAW, period.
  • An AP may configure STA with a high downlink traffic load as TIM STA.
  • Non-TIM station which is type of STA that may not listen to beacons to communicate with the AP.
  • non-TIM STAs may directly negotiate with the AP to obtain a transmission time allocated in a periodic restricted access window, PRAW.
  • the following transmissions may be either periodically defined or renegotiated, depending on the requirements set by the station.
  • the AP may group STAs into smaller groups or sub-groups within each groups using TIM, non-TIM, RAW, PRAW, page, page slicing etc., which are defined in 802.1 1 ah standard.
  • the 802.1 1 ah standard defines Association identifier structure, AID, to support the up to 8191 STAs served by the AP in one Basic Service Set, BSS.
  • TIM, page, page slicing, RAW are the mechanisms defined in the standard to further divide the up to 8191 STAs in different groups and sub-groups. For e.g. 8191 STAs, the STAs may be divided into 8 TIM groups of around 1000 STAs each.
  • each of the TIM groups can be divided into 4 pages of 250 STAs each.
  • each of the pages may be divided into 32 page slices of 8 STAs each.
  • RAW groups may be defined to divide these 8 STAs within a page slice in smaller sub-groups.
  • 2013/0155930 and US patent application 2013/0229959 that discusses how to form such groups.
  • US2013/0155930 it is proposed to organize the STAs base on similar power save requirements and/or based on nearby geographical location.
  • US2013/0229959 it is discussed to assign STAs to one of multiple groups based on wake-up intervals, in which STAs assigned to a group all have the same wake-up interval and each group has a different wake-up intervals. It would be beneficial to form such groups of STAs connected to an AP such that contention is minimized and/or such that radio resources of the AP are better utilized.
  • contention contention is minimized and/or such that radio resources of the AP are better utilized.
  • An access point receives from a plurality of STAs, or in any other way learns, STA specific Signal to Noise Ratio, SNR, bandwidth and amount of traffic.
  • the AP uses this information to form groups of STAs as will be explained further, using a time-need, tn, metric, which may be computed as follows in function (1 ):
  • Time-need, tn is a metric proportional to the communication time need that each STA needs for its current wireless communication.
  • Tn is based on the channel rate of the channel connecting the STA with the AP, and traffic need.
  • the channel rate is a function of the available bandwidth for the STA and the channel quality, e.g. the SNR or SINR of the link (or channel) between the STA and the AP.
  • the STAs bandwidth, BW, and SNR are known at the access point.
  • Traffic represents the amount of data to be sent between the STA and the AP, which is either learned at the AP or signaled by the STA to the AP, e.g. based on the application need at the STA. Signaling of the traffic need of the STA to the AP or the learning algorithm at the AP to determine the traffic need of the STA is not explained further herein.
  • the variables W-i, W 2 , W 3 symbolizes weights for bandwidth, SNR and Traffic, respectively.
  • the function (1 ) the following behavior is achieved: If the STA has high BW and high SNR, it will need less time for data transmission. Moreover, if the STA has less traffic needs, it will need less time for data transmission. In other words, if the STA has "k" times bandwidth, the time for data transmission is reduced by "k” times. Moreover, if the STA has "k" times traffic, then the time for data transmission is increased by "k” times.
  • Fig. 4 describes another embodiment performed by a network node such as an AP for handling radio resources in a wireless communication network, especially in a M2M network based on 802.1 1 h.
  • the method comprises obtaining 402 the values of BW, SNR, Traffic, and possibly also Wi , W 2 and W 3 .
  • the AP then calculates 404 the tn metric for each STA in its coverage area, for example in its Basic Service Set, BSS. Thereafter, the AP groups 406 the STAs into different groups using the calculated metric tn of each STA. Then the AP allocates 408 communication time to each group of STAs using their respective calculated metric tn.
  • the AP then tracks the BW, SNR and Traffic of specific STAs and if any of them have changed 410, recalculates 404 the value of the metric tn and possibly re-assigns the STA to a different group of STAs, depending on the recalculated value.
  • the method can be used in a 802.1 1 ah WLAN network where a group of STAs can be a Traffic Indication Map, TIM, group or a subgroup of STAs (i.e. RAW group) within the TIM group.
  • the 802.1 1 ah AP receives signals from the individual STAs about the amount of traffic, the BW and the SNR of the STAs, or in any other way learns about any of the amount of traffic, the BW and the SNR . With this information, the AP computes the metric tn as in step 404.
  • the APs may further calculate the average metric tn and its standard deviation ⁇ 2 for each group.
  • Different types of groups can be imagined such that e.g. the average metric of all groups tn is similar, the average metric of all groups tn is similar and its standard deviation ⁇ 2 is small or the average metric of the groups tn having large mutual differences.
  • the allocation of time to each group may be performed so that each group of STAs are allocated transmission time in proportion to its average metric tn.
  • the groups receive similar time allocations, if all groups have similar average metric and their standard deviations ⁇ 2 are small, then the groups receive similar time allocations, and if all groups have large differences in their average metric , then the groups receive time allocation proportionally to the average metric .
  • the AP can use modulation and coding scheme, MCS, for grouping of the STAs, instead of using SNR.
  • MCS modulation and coding scheme
  • a TIM beacon is sent by the AP every TIM beacon interval, which is the same time for all TIM beacons.
  • the AP can construct TIM groups with similar average metric tn, thus the time allocation of the TIM groups will be similar and will be proportional to the beacon intervals.
  • the AP can construct groups within TIM groups, i.e. RAW groups, with large differences of average metric tn, thus the time allocation of each RAW groups will be different, but still in proportion to their average metric tn .
  • an AP serves 8191 STAs, which are divided into 8 TIM groups of 1000 STAs each.
  • the time-metric tn is calculated for the 1000 STAs.
  • the AP groups the 1000 STAs into two smaller groups, based on similar values of metric tn.
  • the first group of 500 STAs has tn at approximately 0.25 and the second group of 500 STAs has tn at approximately 0.5.
  • the AP allocates the STAs of the second group double the time to access the communication channel towards the AP compared to the STAs of the first group.
  • Fig. 6 shows a network node 120 operable in a wireless communication network, for improving radio resource utilization.
  • the dashed lines in the figure are used to illustrate that those boxes are only optional.
  • the network node 120 comprises a processor 603 and a memory 604.
  • the memory contains instructions executable by said processor, whereby the network node 120 is operative for obtaining, for each of a plurality of mobile stations 101 , 102, 103 wirelessly connected to the network node 120, a channel quality describing a quality of a radio channel connecting the one of the plurality of mobile stations to the network node, a channel bandwidth of the radio channel connecting the one of the plurality of mobile stations to the network node, and a measure of an amount of data to communicate between the one of the plurality of mobile stations and the network node.
  • the memory further contains instructions executable by said processor, whereby the network node 120 is operative for determining a communication time need for each of the plurality of mobile stations based on the obtained channel quality, the obtained channel bandwidth and the obtained measure of amount of data to communicate for each respective mobile station, grouping the plurality of mobile stations into one or more subgroups based on their respective determined communication time need, and allocating transmission time to each of the one or more subgroups based on the determined time need.
  • the memory 604 further contains instructions executable by said processor, whereby the network node 120 is operative for, in the determining, weighting at least one of the channel quality, the channel bandwidth and the amount of data to communicate differently than the other two.
  • said memory 604 further contains instructions executable by said processor, whereby the network node 120 is operative for determining an average communication time need for the mobile stations grouped into one subgroup based on the determined individual time need for each mobile station in that subgroup, and wherein the allocation is performed based on the determined average communication time need.
  • said memory 604 further contains instructions executable by said processor, whereby the network node 120 is operative for obtaining, for at least one of the plurality of mobile stations, an updated value for any of the channel quality, the channel bandwidth and the amount of data to communicate, the updated value being different from the already obtained channel quality, channel bandwidth or amount of data to communicate.
  • said memory 604 may further contain instructions executable by said processor, whereby the network node 120 is operative for redetermining, for the at least one of the plurality of mobile stations, the time need based on the updated value and the of the channel quality, the channel bandwidth and the amount of data to communicate for which no updated value has been obtained, regrouping the plurality of mobile stations into subgroups based on the re-determined time need, and reallocating transmission time to each subgroup based on the re-determined time need.
  • said memory 604 further contains instructions executable by said processor, whereby the network node 120 is operative for only performing the regrouping and the reallocating when a certain amount of values of the channel quality, the channel bandwidth and/or the amount of data to communicate have been updated.
  • the network node 120 may further comprise a communication unit 602, which may be considered to comprise conventional means for wirelessly
  • the conventional communication means may include at least one transceiver.
  • the communication unit may further comprise one or more communication ports for communicating with other nodes higher up in the network, such as a Mobility Management Entity, MME, in case of an LTE network.
  • MME Mobility Management Entity
  • the network node may further comprise one or more storage units 606 and further functionality 607 useful for the network node to serve its purpose as network node.
  • the instructions executable by said processor may be arranged as a computer program 605 stored in said memory 604.
  • the processor 603 and the memory 604 may be arranged in an arrangement 601 .
  • the arrangement 601 may be a micro processor and adequate software and storage therefore, a Programmable Logic Device, PLD, or other electronic component(s)/processing circuit(s) configured to perform the actions, or methods mentioned above.
  • the computer program 605 may comprise computer readable code means, which when run in the network node 120 causes the network node to perform the steps described in any of the described embodiments.
  • the computer program may be carried by a computer program product connectable to the processor.
  • the computer program product may be the memory 604.
  • the memory 604 may be realized as for example a RAM (Random-access memory), ROM (Read-Only Memory) or an EEPROM (Electrical Erasable Programmable ROM).
  • the computer program may be carried by a separate computer-readable medium, such as a CD, DVD or flash memory, from which the program could be downloaded into the memory 604.
  • the computer program may be stored on a server or any other entity connected to the communication network to which the network node has access via its communication unit 602. The computer program may then be downloaded from the server into the memory 604.
  • Fig. 7 describes another embodiment of a network node 120 in a wireless communication network, for improving radio resource utilization.
  • the network node comprises an obtaining module 702 for obtaining, for each of a plurality of mobile stations 101 , 102, 103 wirelessly connected to the network node 120, a channel quality describing a quality of a radio channel connecting the one of the plurality of mobile stations to the network node, a channel bandwidth of the radio channel connecting the one of the plurality of mobile stations to the network node, and a measure of an amount of data to communicate between the one of the plurality of mobile stations and the network node.
  • the network node 120 further comprises a determining module 704 for determining a communication time need for each of the plurality of mobile stations based on the obtained channel quality, the obtained channel bandwidth and the obtained measure of amount of data to communicate for each respective mobile station.
  • the network node further comprises a grouping module 706 for grouping the plurality of mobile stations into one or more subgroups based on their respective determined communication time need, and an allocating module 708 for allocating transmission time to each of the one or more subgroups based on the determined time need.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé mis en œuvre par un nœud de réseau (120) dans un réseau de communication sans fil (100), afin d'améliorer l'utilisation des ressources radio issues de ressources radio sans fil fournies par le nœud de réseau. Le procédé comprend l'obtention, pour chaque station mobile parmi une pluralité de stations mobiles (101, 102, 103) connectées sans fil au nœud de réseau (120), d'une qualité de canal décrivant une qualité d'un canal radio reliant la station mobile parmi la pluralité de stations mobiles au nœud de réseau, d'une bande passante de canal du canal radio reliant la station mobile parmi la pluralité de stations mobiles au nœud de réseau et d'une mesure d'une quantité de données à communiquer entre la station mobile parmi la pluralité de stations mobiles et le nœud de réseau. Le procédé comprend en outre la détermination d'un temps de communication nécessaire pour chaque station mobile parmi la pluralité de stations mobiles sur la base de la qualité de canal obtenue, de la bande passante de canal obtenue et de la mesure obtenue de la quantité de données à communiquer pour chaque station mobile respective, le regroupement de la pluralité de stations mobiles en un ou plusieurs sous-groupes sur la base de leurs besoins de temps de communication déterminés respectifs et l'attribution d'un temps de transmission à chaque sous-groupe du ou des sous-groupes en fonction du temps déterminé requis.
PCT/SE2015/050088 2015-01-28 2015-01-28 Procédé et nœud de réseau destinés à améliorer l'utilisation de ressources radio dans un réseau de communication sans fil WO2016122361A1 (fr)

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