WO2014171895A1 - Procédé de réalisation d'une opération d'un réseau de communication et composant de réseau - Google Patents

Procédé de réalisation d'une opération d'un réseau de communication et composant de réseau Download PDF

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Publication number
WO2014171895A1
WO2014171895A1 PCT/SG2014/000169 SG2014000169W WO2014171895A1 WO 2014171895 A1 WO2014171895 A1 WO 2014171895A1 SG 2014000169 W SG2014000169 W SG 2014000169W WO 2014171895 A1 WO2014171895 A1 WO 2014171895A1
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Prior art keywords
network
operating
channel
spectrum band
common channel
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PCT/SG2014/000169
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English (en)
Inventor
Qian Chen
Xiaoming Peng
Khiam Boon Png
Po Shin Francois Chin
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Agency For Science, Technology And Research
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Priority to CN201480034650.6A priority Critical patent/CN105557009A/zh
Publication of WO2014171895A1 publication Critical patent/WO2014171895A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • Various embodiments generally relate to the field of performing an operation of a communication network, in particular, Medium Access Control protocols for dynamic bandwidth control for network operations. Background
  • IEEE 802.11 working group also approved a new task group IEEE 802.1 laj to define the specification amendment over the Chinese mmWave frequency bands.
  • the released 60GHz frequency band in China which is smaller than those in other countries, can only cover 2 channels corresponding to channels 2 and 3 used in IEEE 802.11 ad.
  • Channelization with smaller channel bandwidth is considered with the provision of keeping the IEEE 802.11 ad channels for interoperability.
  • Interoperability with IEEE 802.11 ad devices provides the attractive incentive of sharing the scarce spectrum resources between the devices of the two different technology standards which advances the proliferation of devices from both standards.
  • Embodiments of the present invention seek to provide for performing an operation of a communication network which addresses at least one of the above problems and/or needs.
  • a method of performing an operation of a communication network operating in a channel which overlaps, or resides in, a common channel spectrum band comprising the operating network periodically allocating notification periods (NPs) on the common channel spectrum band in a state in which no other network is operating in another channel which overlaps, or resides in, the common channel spectrum band; and the operating network at least transmitting a notification signal in each periodically allocated NP in the common channel spectrum band.
  • NPs notification periods
  • a method of performing an operation of an intended communication network comprising the steps of a network component of the intended network scanning the common channel spectrum band for a notification signal of an operating network; the network component determining from the notification signal that the operating network is operating in a first channel that overlaps with, or resides in, the common channel spectrum band; and the network component joining the existing network as a non- PCP/non-AP station (STA).
  • STA non- PCP/non-AP station
  • a network component of a communication network for operating in a first channel which overlaps, or reside in, a common channel spectrum band
  • the network component comprising an allocator for periodically allocating notification periods (NPs) on the common channel spectrum band in a state in which no other network is operating in another channel which overlaps, or resides in, the common channel spectrum band; and a transmitter for transmitting a notification signal in each periodically allocated NP in the common channel spectrum band.
  • NPs notification periods
  • a network component of an intended communication network comprising a receiver for scanning a common channel spectrum band for a notification signal of an operating network; a determiner for determining from the notification signal that the operating network is operating in a first channel that overlaps with, or resides in, the common channel spectrum band; and wherein the network component is configured to join the existing network as a non-PCP/non-AP station (STA).
  • STA non-PCP/non-AP station
  • FIG. 1 shows an example of beacon interval (BI) structure comprised of a beacon time interval (BTI), an association beamforming training time (A-BFT), an announcement transmission interval (ATI), and two contention-based periods (CBAPs) and two service periods (SPs) within data transfer interval (DTI).
  • BTI beacon time interval
  • A-BFT association beamforming training time
  • ATI announcement transmission interval
  • CBAPs contention-based periods
  • SPs service periods
  • Figure 2 shows conventional dynamic bandwidth control MAC technique.
  • Figure 3a shows an example that PCP/AP 1 operates in a small band and a station (STA) or device (which is later called PCP/AP 2 if it is successful in starting up a new network) joins the PCP/AP 1 's network in the current small band and requests to start up its network in the adjacent unoccupied small band, according to an example embodiment.
  • Figure 3b shows an example of the MAC structure that PCP/AP 2 starts up a new network in the adjacent unoccupied small band after PCP/AP 1 accepts its request and allocates the NPs for it in the large band, according to an example embodiment.
  • Figure 3 c shows an example that PCP/AP 1 ceases its service in a small band while only PCP/AP 2 operates in the adjacent small band, according to an example embodiment.
  • Figure 3d shows an example how PCP/AP 2 moves its TBTT in the large band after PCP/AP 1 ceases its service in the adjacent small band, according to an example embodiment.
  • Figure 4 shows AllocationType field values, according to an example embodiment.
  • Figure 5a and b show respective examples of mixed mode for service compatibility supported by CWPAN or IEEE 802.1 laj to IEEE 802.1 lad, according to example embodiments.
  • Figure 6a-y show respective possible cases of channel occupancy by CWPAN or IEEE 802.1 laj networks, according to example embodiments.
  • Figure 10 shows a schematic diagram illustrating a network component of an intended communication network, according to one embodiment
  • the described embodiments relate to dynamic bandwidth control medium access control (MAC) protocols for resolving co-existence of networks operating in overlapping frequency spectrum bands, and providing compatibility solutions for different devices within a common access frequency spectrum band.
  • MAC medium access control
  • devices preferably can, depending on their capabilities, employ a multitude of mechanisms to mitigate interferences between networks such as switching operation to other frequency bands, joining the existing networks, using spatial beamforming or deferring transmission.
  • the device can either join the existing network in the common band or one of the existing networks that operate in a channel band that reside or overlap the common band.
  • This new device can be of the same network type of the existing network(s), or it can be of a different network type from that of the existing network in the band. Furthermore, avoidance of interference from other potential network(s) wanting to start up in a new channel band within a common band where there are already a multitude of existing networks operating in channel bands that overlaps or reside in the common band can preferably be provided in the described embodiments.
  • the following first describes the IEEE 802.1.1 ad MAC beacon interval (BI) and dynamic bandwidth control MAC protocols for an example usage model, as described in the IEEE P802.11adTM-2012 Standard "Part 1 1 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment 3: Enhancements for Very High Throughput in the 60 GHz band," December 2012.
  • BI IEEE 802.1.1 ad MAC beacon interval
  • PHY Physical Layer
  • FIG 1 shows an example of beacon interval (BI) structure 100 comprised of a BTI 102, an A-BFT 104, an ATI 106, and two CBAPs 108, 1 10 and two SPs 112, 1 14 within data transfer interval (DTI) 116 as specified for a directional multi-gigabit (DMG) system in the IEEE P802.11ad/D9.0 Standard "Part 11 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 5: Enhancements for Very High Throughput in the 60 GHz band," December 2012.
  • DMG data transfer interval
  • the beacon interval in IEEE 802.11 ad MAC is mainly divided into 4 parts
  • BTI Beacon transmission interval
  • PCP Personal basic service set central point
  • AP Access point
  • DMG Beacon frame carries network management information.
  • DMG Beacon frame supports network synchronization function.
  • DMG Beacon frame is used to as training frame for beamforming between PCP/AP and non-PCP/non-AP stations (ST As).
  • a ST A scans for a beacon, continues with the beam forming process with the PCP/AP in the A-BFT and then associates with the PCP/AP during the AT or CBAP.
  • PCP/AP schedules contention-based access period (CBAP) and service period (SP) allocations in the data transfer interval (DTI).
  • DTI Data transfer interval
  • ⁇ Access during CBPs is based on a modified IEEE 802.1 1 EDCA operation that is fine-tuned for directional communications.
  • ⁇ Access during SPs is scheduled and assigned to specific stations.
  • the assumption of the occupancy of the channels is based on a first-come- first-serve basis. If a network is operating in a channel, a device from another type of network cannot start its operation in the channel. A mechanism to enable this function is assumed.
  • the network device is also assumed to be able to detect the beacons of an existing network of its own type as well as the beacons of an existing network of another type. Furthermore, it is assumed that at least one type of network device can operate in both a large band (the common channel spectrum band) as well as a smaller band, which reside within the common channel spectrum band, while at least one other type of network device can operate only in the large band as specified in published international patent application WO2012121676 Al and published international patent application WO2012121672 Al. In addition, the network device of the first type can operate in its own type of network as well as in the latter type of network.
  • a new network device When a new network device wants an existing network to be split to a smaller channel from a large channel, it will first join the existing network. This device then sends a command frame to the personal basic service set central point/access point (PCP/AP) of the existing network to request for the channel splitting.
  • PCP/AP personal basic service set central point/access point
  • a request data frame is used to do channel splitting. If the existing network decides to split its large channel to a smaller channel, it informs all of its devices in the network, including the requesting device, through its beacon time to change its operating channel to a smaller operating channel.
  • a channel switch announcement information element (IE) can be used in the beacon to announce the switching to the new smaller channel.
  • a response data frame can also be sent to the requesting device who wants to start a new network.
  • the existing network suspends its operation in the larger channel after a period of time. Then, the existing network continues its operation as a new network and does the necessary procedures in a new smaller channel when the designated time has arrived. For example, beamforming, association, new schedules for service periods (SPs) and contention-based periods (CBAPs), etc.
  • the requesting device who wants to start up another new network waits for the designated time under the proposed MAC protocols in published international patent application WO2012121676 Al before starting its network operation in its small band.
  • the requesting device needs to listen to the channel switch announcement IE in the beacon of the existing network.
  • the requesting device will start up its operation as a new PCP/AP of the new network in the smaller band.
  • both the existing PCP/AP and the new PCP/AP must periodically send the notification signals, e.g., DMG Beacon f ames as described in published international patent application WO2012121676 Al , in the existing large band during the notification periods (NPs).
  • DMG Beacon f ames as described in published international patent application WO2012121676 Al
  • Other devices who want to join this new network in the other smaller channel can do so through standard beamforming and association procedures.
  • a PCP/AP of a network operating in a smaller channel periodically does channel detection on its adjacent smaller channel which could potentially be used to form a larger channel to improve performance if its network in the adjacent smaller band ceases operation. If a vacant adjacent smaller channel is detected, the PCP/AP can decide if it wants to expand its smaller channel to a larger channel. If the existing network decides to expand its smaller channel to a larger channel, it informs all of its devices in the network through its beacon time to change its operating channel to a larger operating channel. The channel switch announcement information element (IE) can be used in the beacon to announce the channel switching to the new larger channel. Then, the existing network suspends its operation after a period of time.
  • IE channel switch announcement information element
  • example embodiments of the present invention can advantageously ensure the co-existence of different networks while limiting the potential interference between different types of networks through mandating:
  • a CWPAN or IEEE 802.1 1 aj device (termed the upcoming device) is able to operate in large band LI or L2 and is also able to operate in small bands S3, S4, S5 or S6.
  • An IEEE 802.1 lad device (termed the legacy device) can only operate in the large band LI or L2.
  • the large band LI or L2 will be the large common channel spectrum band to send the notification signals which in this case is the DMG Beacon frames.
  • PCP/AP 2 wants to start another network by splitting the large band into two smaller bands, then PCP/AP 2 will join the existing PCP/AP l 's networks in the large band and then request for the channel split. After a successful channel split procedure, PCPs/APs 1 and 2 will operate in the small band S5 and S6, respectively, and also send their notification signals, e.g., DMG Beacon frames, during NPs 1 and 2, respectively. • When one of the two CWPAN or IEEE 802.1 laj networks ceases its service in either the small band S5 or S6, the other one will expand its bandwidth from its small band to the large band after a successful channel merge procedure.
  • notification signals e.g., DMG Beacon frames
  • the MAC protocols are extended to other foreseeable operating scenarios, where CWPAN, IEEE 802.1 laj and IEEE 802.11 ad devices are deployed, with support for interoperability.
  • only one CWPAN or IEEE 802.1 laj device starts its network and operates in the small band S5 (or S6) with the designated device PCP/AP 1, leaving the other band S6 (or S5) vacant.
  • PCP/AP 2 (or PCP/AP 1) ceases its services in the small band S6 (or S5).
  • PCP/AP 1 or PCP/AP 2 continues to operate in the small band S5 (or S6) without channel merge, in contrast to the scenario in published international patent application WO2012121676 Al .
  • PCP/AP 1 can operate in the small band S5 (or S6) with the MAC protocols as described in published international patent application WO2012121676 Al , while the other small band S6 (or S5) is now available for establishing another new network as illustrated in Figure 3 a.
  • PCP/AP 1 in an example embodiment periodically sends the notification signals during NPs in the large band LI (see NP 1 in Figure 3a), e.g., DMG Beacon frames, to allow both types of devices to recognize the notification signals.
  • NPs that are allocated in the large bands are illustrated as slots extending across the small bands, e.g. NP 1 extends across S5 and S6 in Figure 3a, i.e. is allocated in the large band LI (compare Figure 2).
  • Either a notification signal as described in published international patent application WO2012121676 Al can be transmitted in an NP in the large band, which basically consists only of the BTI 300 shown in Figure 3a, or an NP in the large band can contain a beacon header interval (BHI) which may include the BTI 300, A-BFT 302, or ATI 304 as defined in the IEEE P802.1 ladTM-2012 Standard "Part 1 1 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment 3: Enhancements for Very High Throughput in the 60 GHz band," December 2012.
  • BHI beacon header interval
  • the first type of NP is denoted as type A NP and the second type of NP as type B NP hereinafter.
  • At least one type B NP is allocated in the example embodiment for every consecutive number, NM CX _A, of type A NP allocations, where NMO X _A is determined by the maximum number of Bis after which a A-BFT or ATI is expected as specified in the IEEE P802.1 ladTM-2012 Standard "Part 11 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment 3: Enhancements for Very High Throughput in the 60 GHz band," December 2012. It is noted that the minimum duration of the BHI is indicated in the example embodiments by a dotl 1 MinBHIDuration parameter which is specified in microseconds.
  • Protocol 1 A first protocol according to an example embodiment, Protocol 1, may be described as: Protocol 1: A network operating in a channel band overlapping, or residing in, a common channel band periodically allocates notification periods (NP) which contain at least a transmission of notification signals in the common spectrum band.
  • NP notification periods
  • the PCP/AP 2 shall scan in the large band LI before the network initialization. Thus, it can hear the notification signals, e.g., DMG Beacon frames transmitting in the BTI of PCP/AP 1 within the large band LI and can obtain the information that PCP/AP 1 is currently operating in the small band S5 accordingly. Moreover, the PCP/AP 2 may obtain the information that the other small band S6 is now available for occupancy which can be indicated by a channel occupancy element transmitted in the DMG Beacon frames as mentioned above. Note that if such an information element (IE) is not transmitted, the PCP/AP 2 in the example embodiment further scans in the small band S 5 and S6 to know the small band occupancy status.
  • IE information element
  • PCP/AP 2 need only scan each small band S5, S6 for the duration between two NPs to know the occupancy status.
  • the scanning of the two bands S5, S6 can adyantageously be done concurrently or successively depending on the capability of PCP/AP 2.
  • PCP/AP 2 will join the existing PCP/AP l 's network either in the large band Ll or in the small band S5 as a station (or called non- PCP/non-AP, (ST A)) through a bootstrapping procedure.
  • PCP/AP 2 will send the Request frame to PCP/AP 1 during the ATI or during a scheduled SP or CBAP of DTI within the band where it joins.
  • the Request frame contains the request that PCP/AP 2 intends to start its network in the adjacent small band S6 and other information such as the required length of NP duration, etc.
  • the PCP/AP 1 may reject the PCP/AP 2's request when another new network that has been successfully established or granted to start up in the small band S6. If the PCP/AP 1 grants the request, it shall notify PCP/AP 2 through a Grant frame, DMG Beacon frames or Announce frames.
  • PCP/AP 1 as well as PCP/AP 2 in the example embodiment periodically send the notification signals during their NPs in the large band LI . Therefore, as shown in Figure 3b, the PCP/AP 1 allocates an SP for the NP of PCP/AP 2, NP 2, within the large band LI through an Extended Schedule Element contained in the DMG Beacon frames or Announce frames that are transmitted within the band LI or S5 in which the PCP/AP 2 joined before. It is noted that in the example embodiment the allocations of NPs (here NP 1 and NP 2) within the large band LI are persistently reserved by both PCPs/APs 1 and 2 unless their networks cease the services later.
  • the NPs in one cycle allocated for PCPs/APs 1 and 2 are preferably arranged consecutively without interspaces; in which case they will have the same cycle time. Furthermore, without moving the target beacon transmission time (TBTT) of PCP/AP 1 in the small band S5, the NP of PCP/AP 2, e.g., NP 2 is preferably arranged prior to the NP of PCP/AP 1 , e.g., NP 1, which is illustrated in Fig. 3(b).
  • This arrangement advantageously allows PCP/AP 1 and PCP/AP 2 to minimize the bandwidth switch cost between small bands and large band.
  • each PCP/AP preferably needs to only switch from its own small band to the large band (i.e.
  • the common spectrum band once to transmit its DMG Beacon frames and subsequently receive the DMG Beacon frame from the other PCP/AP during NP 1 and NP 2 in the large band, shown respectively as 306, 308 and then switch back to its small band in every cycle.
  • the switching time between the large band and small band and vice versa depend on the implementation of the RF circuit, with a typical duration of around hundreds of micro-seconds.
  • the NP duration preferably includes the switching time.
  • PCP/APs are preferably synchronized periodically during each cycle. This can for example be fulfilled by time synchronization function (TSF) defined in IEEE 802.1 1 with PCP/AP 2 receiving the frame from PCP/AP 1 during PCP/AP 1 's NP, i.e. NP 1 308 in the large band as shown in Figure 3b.
  • TSF time synchronization function
  • the periodicity of NPs in the example embodiment is determined by both the minimum synchronization period required by PCP/APs operating in the small bands and maximum channel scan time required by PCP/APs operating in the large band.
  • the cycle time of NP in an example embodiment is not set larger than 1000 TUs.
  • the actual cycle time of NP is preferably determined by PCP/AP 1 before the first NP with the constraints stated above.
  • a PCP/AP in an example embodiment preferably waits for a MaxExpireDuration duration, which is an integer multiple of Bis, starting from when the last frame from the other PCP/AP is received, before making the decision that the other adjacent PCP/AP's network has ceased its network operation.
  • the remaining PCP/AP can have two options: 1) Expand its bandwidth from the small band to the large band, which has been described in published international patent application WO2012121676 Al . 2) Proceed to operate in the small band S5 without channel merge in an example embodiment, following the MAC protocol designated as Protocol 3 specified below,
  • Protocol 3 If the PCP/AP 2 is absent from the small band S6, the PCP/AP 1 proceeds its services in the small band S5 but will no longer reserve the SP allocations, i.e., NP 2, in the large band LI for the PCP/AP 2's NPs in the following medium time, which reverts back to operation shown in Figure 3 a.
  • PCP/AP 2 may extend its NP to cover the whole duration of the previous NP 1 and 2 or schedule the allocations in the small band S6 within this now vacant period (indicated at numeral 310 in Figure 3c).
  • the PCP/AP 2 may select to move its target beacon transmission time (TBTT) for NP 2 within the large band LI prior to the starting of the TBTT for the BHI 312 within the small band S6, as shown in Figure 3d such that NP2 is followed by BHI 312 consecutively without any interspaces in this embodiment.
  • TBTT target beacon transmission time
  • the example embodiments described above also preferably aim to support the interoperability between different types of network device, which in the context of the example usage model of 60 GHz operation, can also be interpreted as providing backward compatibility with service supports to the legacy network, e.g., CWPAN or IEEE 802.1 1 aj networks providing backward compatibility to IEEE 802.1 lad networks.
  • the legacy network e.g., CWPAN or IEEE 802.1 1 aj networks providing backward compatibility to IEEE 802.1 lad networks.
  • the IEEE 802.11 ad devices operate in the large bands only. Therefore, an IEEE 802.1 lad device can start a new network as a PCP/AP or join an existing network as a non-PCP/non-AP STA in a large band.
  • the CWPAN or IEEE 802.1 laj devices can operate either in large bands or in small bands, thus they have the ability to start the new networks either in large bands or in small bands.
  • the IEEE 802.11 ad networks do not support any interoperability to CWPAN or IEEE 802.1 laj networks. Based on first-come first-serve principle, if an IEEE 802.1 1 ad network occupied the large band first, a late coming CWPAN or IEEE 802.11 aj device can only join the IEEE 802.11 ad network as a non-PCP/non-AP STA, become a member PCP/AP when the clustering mechanism is supported by the existing IEEE 802.11 ad network, or search for another available channel to start its network. For all intents and purposes, the new devices act as the legacy devices in this case.
  • CWPAN or IEEE 802.1 laj networks provide the backward compatibility for legacy devices by operating only in the large band.
  • the late coming IEEE 802.1 lad device will decided to join the CWPAN or IEEE 802.1 laj network as a non-PCP/non-AP STA, become a member PCP/AP when the clustering mechanism is supported by the existing CWPAN or IEEE 802.1 laj network, or search for another available channel to start its network, by using existing MAC protocols as detailed in the IEEE P802.1 ladTM -2012 Standard "Part 11 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment 3: Enhancements for Very High Throughput in the 60 GHz band," December 2012.
  • the CWPAN or IEEE 802.1 laj networks behave as would a legacy networks in this mode.
  • the mixed mode supports the backward compatibility for IEEE 802.11 ad devices when CWPAN or IEEE 802.1 laj networks are operating in small bands. It provides the interoperability between CWPAN or IEEE 802.1 laj devices generally operating in the small band and IEEE 802.1 1 ad devices only operating in the large band.
  • the designed MAC protocol according to an example embodiment is detailed as below.
  • PCP/AP 1 not only starts TBTTs in the small band S5, but also sends the notification signals such as DMG Beacon frames during NPs, e.g. NP 1, in the large band LI .
  • the protocols for the legacy device to join and function in the CWPAN or IEEE 802.1 laj network in an example embodiment is designated as Protocol 4 and is described below.
  • Protocol 4 Once a legacy device, e.g., IEEE 802.1 lad device, arrives, it will hear the DMG Beacon frames transmitting during NP 1 within the large band LI and join the PCP/AP l 's network as a non-PCP/non-AP station (STA) through a bootstrapping procedure. Next, this non-PCP/non-AP STA can request for channel time allocation from PCP/AP 1.
  • a legacy device e.g., IEEE 802.1 lad device
  • PCP/AP 1 will allocate SPs or CBAPs 500 to the IEEE 802.11 ad device in the large band following the medium access rules in the IEEE P802.11adTM-2012 Standard "Part 11 : Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment 3: Enhancements for Very High Throughput in the 60 GHz band," December 2012 and notify the scheduling results to the IEEE 802.11 ad device through DMG Beacon frames or Announce frames.
  • MAC Wireless LAN Medium Access Control
  • PHY Physical Layer
  • the Bit 5 of the AllocationType field is used to indicate whether an allocation is within the large band or the small band.
  • the possible values are listed in Figure 4, which supports the backward compatibility to IEEE 802.1 lad devices in the example embodiment.
  • a CWPAN, IEEE 802.1 laj or an IEEE 802.11 ad device that is identified as a source or destination may transmit frames during this period.
  • a CWPAN or IEEE 802.1 l aj non-PCP/non-AP ST As operating in the small band S5 intends to communicate with a CWPAN, IEEE 802.1 laj or IEEE 802.11 ad device operating in the large band LI , it switches its frequency from the small band S5 to the large band LI, after which it switches back and continues to operate in the small band S5.
  • Protocol 5 The protocols for the legacy device to join and function in the CWPAN or IEEE 802.1 laj networks in an example embodiment is designated as Protocol 5 and is described below.
  • Protocol 5 When an IEEE 802.1 lad device (named as STA A) arrives and intends to join as a non-PCP/non-AP STA, it will first scan in the large band LI . Considering the hidden terminal problem, STA A may receive the DMG Beacon frames transmitted by either the PCP/AP 1 or PCP/AP 2 or both. Without loss of generality, it is supposed that STA A received the DMG Beacon frames from PCP/AP 1 and intends to join in PCP/AP l 's network.
  • PCP/AP 1 cannot allocate an overlapping duration with the existing allocations, such as the BHIs, SPs or CBAPs either in the large band or in the small bands.
  • PCP/AP 2 should know the updated scheduling information for STA A from PCP/AP 1 and then reserve the same medium time in its following Extended Schedule Element.
  • PCP/AP 1 preferably hears the latest DMG Beacon frames or Announce frames of the PCP/AP 2 either in the NP 2 502 in the large band LI or in the BHI 504 in the small band S6 to update its local scheduling information.
  • PCP/AP 1 may directly request for the latest scheduling information from PCP/AP 2 and receive its reply with an Announce frame containing the Extended Schedule Elements during the NP 1. Then, PCP/AP 1 can schedule an allocation for STA A based on the scheduling information of both PCP/AP 1 and 2.
  • PCP/AP 1 will notify the new scheduling results to PCP/AP 2 through an Allocation Request frame, and then PCP/AP 2 may reply with an Allocation Grant frame to grant this schedule or not. If granted or without hearing the reply, PCP/AP 1 sends the schedule results for the SP or CBAP allocations 506 to STA A through Extended Scheduling Element transmitted in DMG Beacon frames or Announce frame within the large band LT .
  • the allocations in the small bands S5 and S6 in the example embodiment also preferably do not overlap with the existing allocations in the large band LI once it is finalized.
  • An example of the medium access allocation is shown in Figure 5b.
  • Figure 6a shows the state that both the large bands LI and L2 are vacant and available for new network formation.
  • an IEEE 802.1 lad device can follow existing protocols to start a new network and a CWPAN or IEEE 802.1 1 aj device can follow the existing protocol to start a new network in LI or L2, or follow the proposed protocols to start a new network in the small band S3, S4, S5 or S6 and follow the example embodiment, Protocol 1, to mitigate the interference with other networks.
  • Figures 6b and c show respective states in which only one large band is occupied by a CWPAN or IEEE 802.1 laj network while the other(s) are available for occupancy.
  • a new IEEE 802.11 ad device can establish a new network within the unoccupied channel using existing protocols.
  • a CWPAN or IEEE 802.1 l aj device can follow the existing protocol to start a new network in the unoccupied large band channel, or follow the protocols to split the occupied large band channel into two smaller band channels, or follow the protocols to start a new network in the two unoccupied small band channels and follows the example embodiment, Protocol 1, to mitigate the interference with other networks.
  • Figure 6d shows the state that both the large bands LI and L2 are occupied by CWPAN or IEEE 802.1 laj networks.
  • An IEEE 802.1 1 ad device will be duly notified that all available channels are occupied and no new network can be formed except through becoming a member PCP/AP of the cluster either in the large band LI or in the large band L2 through existing protocols.
  • a CWPAN or IEEE 802.1 laj device on the other hand, can follow an existing protocol to split either of the occupied large band channels into two smaller band channels. .
  • Figure 6e-h show respective states in which only one small band is occupied by CWPAN or IEEE 802.1 laj while others are available for occupancy.
  • An IEEE 802.11 ad device can establish a new network within the unoccupied large band using existing protocols.
  • a CWPAN or IEEE 802.1 laj device can follow an existing protocol to start a new network in the unoccupied large band channel, or follow the example embodiment, Protocol 2, to start a new network in the unoccupied small band channel adjacent to the occupied small band, or follow the protocols to start a new network in the other two unoccupied small band channels and follow the example embodiment, Protocol 1, to mitigate the interference with the other network.
  • Figure 6i-l show respective states in which one large band and one small band are occupied by CWPAN or IEEE 802.1 laj networks while only one small band is available for occupancy. If an IEEE 802.1 1 ad device arrives, it will be duly notified that all available channels are occupied and no new network can be formed except through becoming a member PCP/AP of the cluster either in the large band LI or in the large band L2 through existing protocols.
  • a CWPAN or IEEE 802.1 laj device on the other hand, can follow the existing protocols to split the occupied large band channels into two smaller band channels, or follow the example embodiment, Protocol 2, to start a new network in the unoccupied small band channel adjacent to the occupied small band.
  • Figure 6m and n show respective states in which any two small bands within the same large band are occupied by two different CWPAN or IEEE 802.11 aj networks while the other large band is available for occupancy.
  • An IEEE 802. Had device comes An IEEE 802. Had devices can establish a new network within the unoccupied large band using existing protocols.
  • a CWPAN or IEEE 802.1 laj device can follow the existing protocol to start a new network in the unoccupied large band channel, or follow the protocols to start a new network in the other two unoccupied small band channels and follows Protocol 1 to mitigate the interference with other.
  • Figure 6o-r show respective states in which any two small bands within the different large bands are occupied by two different CWPAN or IEEE 802.11 aj networks while the other two small bands are available for occupancy. If an IEEE 802.11 ad device arrives, it will be duly notified that all available channels are occupied and no new network can be formed.
  • a CWPAN or IEEE 802.1 laj device can follow the example embodiment, Protocol 2, to start a new network in either of the unoccupied small band channel adjacent to an occupied small band.
  • Figure 6s and t show respective states in which one large band and the other two small bands are occupied by three different CWPAN or IEEE 802.1 laj networks. If an IEEE 802.1 lad device arrives, it will be duly notified that all available channels are occupied and no new network can be formed except through becoming a member PCP/AP of the cluster either in the occupied large band through existing protocols. A CWPAN or IEEE 802.1 laj device on the other hand, can follow an existing protocol to split the occupied large band channels into two smaller band channels.
  • Figure 6u-x show respective states in which any three small bands are occupied by three different CWPAN or IEEE 802.1 laj networks while only one small band is available for occupancy.
  • a CWPAN or IEEE 802.1 laj device can follow the example embodiment, Protocol 2, to start a new network in the unoccupied small band channel.
  • Figure 6y shows that all the small bands are occupied by different CWPAN or IEEE 802.1 laj networks.
  • an IEEE 802.1 lad device or a CWPAN or IEEE 802.1 laj device comes, it will be duly notified that all available channels are occupied.
  • the CWPAN or IEEE 802.1 laj networks function in the legacy mode to service IEEE 802.11 ad devices joining the networks.
  • the IEEE 802.11 ad devices and the CWPAN or IEEE 802.1 laj network follow the example embodiment, Protocol 4, to support interoperability.
  • the CWPAN or IEEE 802.1 laj network in the large band function in the legacy mode to service IEEE 802.1 lad devices joining the network while the CWPAN or IEEE 802.1 laj network in the small band follows the example embodiment, Protocol 4, to provide backward compatibility support for IEEE 802.1 l ad devices.
  • the IEEE 802.11 ad devices and the CWPAN or IEEE 802.1 laj network follow the example embodiment, Protocol 5, to support interoperability.
  • the IEEE 802.11 ad devices and the CWPAN or IEEE 802.1 laj networks in both small bands follow the example embodiment, Protocol 4, to support interoperability.
  • the CWPAN or IEEE 802.1 laj network in the large band function in the legacy mode to service IEEE 802.1 lad devices joining the network while the CWPAN or IEEE 802.1 l aj network in the small band follows the example embodiment, Protocol 5, to provide backward compatibility support for IEEE 802.1 1 ad devices.
  • the CWPAN or IEEE 802.1 laj network operating in a small band with an adjacent occupied small band follows the example embodiment, Protocol 5, to provide backward compatibility support for IEEE 802.1 l ad devices while the CWPAN or IEEE 802.1 laj network operating in a small band with an adjacent vacant small band follows the example embodiment, Protocol 4, to provide backward compatibility support for IEEE 802.11 ad devices.
  • the IEEE 802.1 lad devices and the CWPAN or IEEE 802.1 laj network follow the example embodiment, Protocol 5, to support interoperability.
  • the first example policy is termed legacy mode where support for legacy devices is prioritized.
  • CWPAN or IEEE 802.1 laj network switch and operate only in the large band to support the backward compatibility to the legacy devices, e.g., IEEE 802.1 lad devices, as the legacy devices appear in the service area.
  • legacy devices e.g., IEEE 802.1 lad devices
  • both small bands within the same large band are occupied by two different CWPAN or IEEE 802.1 laj networks. If an IEEE 802.1 lad device arrives, it can join in one of the existing CWPAN or IEEE 802.1 laj networks without any SP or CBAP allocation or be rejected, until one of CWPAN or IEEE 802.1 l aj networks ceases its service and the remaining one finishes the channel merge procedures.
  • the second policy example can be termed the exclusive mode where support for legacy devices is minimal. If a CWPAN or an IEEE 802.1 laj network operates in one of the small bands within the current large band, it will not do the channel merge procedures to support the late arriving IEEE 802.11 ad devices. Therefore, the IEEE 802.1 1 ad devices are not allowed to join unless the existing or a new CWPAN or IEEE 802.1 laj network operates in the current large band or a large band is available for occupancy.
  • the support for the legacy devices is limited to notify the late arriving IEEE 802.1 l ad devices of the occupancy of the channel and the late arriving IEEE 8021.1 lad devices cannot obtain any service from the CWPAN or IEEE 802.11 aj network.
  • Providing for the fidelity of the notification signals sent in the common channel spectrum band by establishing notification periods within the networks operating in the other channel spectrum bands where its devices in their respective networks temporarily suspend all transmissions in their respective network's channel spectrum band and synchronizing quiet periods of independent networks when the two or more networks are in operation with synchronization achieved through communications between devices in different networks either in the common spectrum band or other designated spectrum bands in which the devices can operate.
  • MAC protocols for negotiating between the existing networks to adjust the location and the duration of the notification periods in the common channel spectrum band to suit the requirements above for the networks operating in channel bands overlapping or residing in the common spectrum band.
  • the above mentioned quasi-omni beacon frames in example embodiments are the basic information and directions for further actions to preferably allow other technologies working in 60 GHz to recognise and make independent decisions without major change in their basic network scanning procedures.
  • Embodiments of the present invention can, for example:
  • the method can be easily tailored to suit different operating assumptions and objectives.
  • Figure 7 shows a flowchart 700 illustrating a method of performing an operation of a communication network operating in a channel which overlaps, or resides in, a common channel spectrum band, according to one embodiment.
  • the operating network periodically allocates notification periods (NPs) on the common channel spectrum band in a state in which no other network is operating in another channel which overlaps, or resides in, the common channel spectrum band.
  • the operating network at least transmits a notification signal in each periodically allocated NP in the common channel spectrum band.
  • the operating network may reserve a service period (SP) in the common channel spectrum for the NPs of one or more other networks which start operating in another channel overlapping, or residing in, the common channel spectrum band.
  • SP service period
  • the operating network may cease to reserve SP allocations to the NPs of said one of the one or more other networks. If one of the one or more other networks ceases, the operating network may extend its NPs to cover the whole duration of its previous NPs and the NPs of said one of the one or more other networks. If one of the one or more other networks ceases, the operating network may move its target beacon transmission time (TBTT) within the common channel spectrum band prior to the starting of its TBTT within its channel.
  • TBTT target beacon transmission time
  • the method may further comprise synchronizing the NPs between the operating network and the one or more further networks.
  • a first type of the notification signal may comprise a beacon transmission interval (BTI).
  • a second type of the notification signal may comprise a beacon header interval (BHI).
  • At least one notification signal of the second type may be allocated for every consecutive number, NM E _A of notification signals of the first type, wherein NM 3X _ A is determined by the maximum number of beacon intervals (Bis) after which an association beamforming training (A-BFT) or an announcement transmission interval (ATI) is expected.
  • the method may further comprise a network component of an intended network scanning the common channel spectrum band for a notification signal of the operating network; the network component determining from the notification signal that the operating network is operating in a first channel that overlaps with, or resides in, the common channel spectrum band; and the network component joining the operating network as a non-PCP/non-AP station (STA).
  • STA non-PCP/non-AP station
  • the method may further comprise the STA sending a request to the operating network to start the intended network in a second channel that overlaps with, or resides in, the common channel spectrum band.
  • the method may further comprise the STA receiving a grant from the operating network and starting the intended network in the second channel.
  • the method may further comprise the STA sending a request for channel time allocation to the operating network, and the operating network allocating SPs or contention-based access periods (CBAPs) to the STA in the common channel spectrum band.
  • the method may comprise indicating whether an allocation is within the first channel or within the common channel spectrum band.
  • the operating network may allocate the SPs or CBAPs based on existing allocations in another network which started operating in another channel that overlaps with, or resides in, the common channel spectrum band.
  • the operating network may scan the common channel spectrum band or the second channel for determining information about the existing allocations in the other network.
  • the operating network may request information about the existing allocations in the other network from the other network.
  • FIG 8 shows a flowchart 800 illustrating a method of performing an operation of an intended communication network according to one embodiment.
  • a network component of the intended network scans the common channel spectrum band for a notification signal of an operating network.
  • the network component determines from the notification signal that the operating network is operating in a first channel that overlaps with, or resides in, the common channel spectrum band.
  • the network component joins the existing network as a non-PCP/non-AP station (STA).
  • STA non-PCP/non-AP station
  • the STA may send a request to the operating network to start the intended network in a second channel that overlaps with, or resides in, the common channel spectrum band.
  • the STA may receive a grant from the operating network and starting the intended network in the second channel, the STA may send a request for channel time allocation to the operating network, and the operating network may allocate SPs or contention-based access periods (CBAPs) to the STA in the common channel spectrum band.
  • the operating network may allocate the SPs or CBAPs based on existing allocations in another operating network operating in another channel that overlaps with, or resides in, the common channel spectrum band.
  • the operating network may scan the common channel spectrum band or the second channel for determining information about the existing allocations in the other operating network.
  • FIG. 9 shows a schematic diagram illustrating a network component 900 of a communication network for operating in a first channel which overlaps, or reside in, a common channel spectrum band, according to one embodiment.
  • the network component 900 comprises an allocator 902 for periodically allocating notification periods (NPs) on the common channel spectrum band in a state in which no other network is operating in another channel which overlaps, or resides in, the common channel spectrum band; and a transmitter 904 for transmitting a notification signal in each periodically allocated NP in the common channel spectrum band.
  • NPs notification periods
  • the allocator 902 may be configured to reserve a service period (SP) in the common channel spectrum for the NPs of one or more other networks. If one of the one or more other networks ceases, the allocator 902 may be configured to cease reserving SP allocations to the NPs of said one of the one or more other networks. If one of the one or more other networks ceases, the allocator 902 may be configured to extend its NPs to cover the whole duration of its previous NPs and the NPs of said one of the one or more other networks. If one of the one or more other networks ceases, the allocator 902 may be configured to move its target beacon transmission time (TBTT) within the common channel spectrum band prior to the starting of its TBTT within its channel.
  • TBTT target beacon transmission time
  • the network component 900 may further comprise a synchronizer 906 for synchronizing the NPS between the respective networks.
  • a first type of the notification signal may comprise a beacon transmission interval (BTI).
  • a second type of the notification signal may comprise a beacon header interval (BHI).
  • At least one notification signal of the second type may be allocated for every consecutive number, NM OX _A of notification signals of the first type, wherein NM 3X _A is determined by the maximum number of beacon intervals (Bis) after which an association beamforming training (A-BFT) or an announcement transmission interval (ATI) is expected.
  • FIG. 10 shows a schematic diagram illustrating a network component 1000 of an intended communication network, according to one embodiment.
  • the network component 1000 comprises a receiver 1002 for scanning a common channel spectrum band for a notification signal of an operating network, a determiner 1004 for determining from the notification signal that the operating network is operating in a first channel that overlaps with, or resides in, the common channel spectrum band, and wherein the network component 1000 is configured to join the existing network as a non-PCP/non-AP station (STA).
  • STA non-PCP/non-AP station
  • the network component 1000 may further comprise a transmitter 1006 for sending a request to the operating network to start the intended network in a second channel that overlaps with, or resides in, the common channel spectrum band.
  • the receiver 1002 may be configured for receiving a grant from the operating network and the network component is configured for starting the intended network in the second channel.
  • the transmitter 1006 may send a request for channel time allocation to the operating network.
  • the receiver 1002 may be configured to receive information indicating whether an allocation is within the first channel or within the common channel spectrum band.
  • the receiver 1002, and/or the determiner 1004, and/or the transmitter 1006 may be implemented in software executed on a computing device and/or in dedicated hardware.
  • substantially may include “exactly” and a variance of +/- 5% thereof.
  • the phrase “A is substantially the same as B” may encompass embodiments where A is exactly the same as B, or where A may be within a variance of +/- 5%, for example of a value, of B, or vice versa.

Abstract

L'invention concerne un procédé qui consiste à réaliser une opération d'un réseau de communication et un composant de réseau. Un procédé de réalisation d'une opération d'un réseau de communication fonctionnant dans un canal qui chevauche, ou réside dans, une bande de spectre de canal commun, consiste à allouer périodiquement, par le réseau d'exploitation, des périodes de notification (NP) sur la bande de spectre de canal commun dans un état dans lequel aucun autre réseau ne fonctionne dans un autre canal qui chevauche, ou réside dans, la bande de spectre de canal commun; et à au moins transmettre, par le réseau d'exploitation, un signal de notification dans chaque NP allouée périodiquement dans la bande de spectre de canal commun.
PCT/SG2014/000169 2013-04-19 2014-04-17 Procédé de réalisation d'une opération d'un réseau de communication et composant de réseau WO2014171895A1 (fr)

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WO2017116137A1 (fr) * 2015-12-29 2017-07-06 엘지전자 주식회사 Procédé de fonctionnement dans un système de réseau local sans fil, et appareil pour la mise en oeuvre dudit procédé
JPWO2016147525A1 (ja) * 2015-03-19 2018-01-25 パナソニックＩｐマネジメント株式会社 通信方法及び通信装置
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JP2020043606A (ja) * 2019-12-05 2020-03-19 パナソニック株式会社 Ｐｃｐ／ａｐ装置、端末装置およびこれらの通信方法
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JPWO2016147525A1 (ja) * 2015-03-19 2018-01-25 パナソニックＩｐマネジメント株式会社 通信方法及び通信装置
JP2020162164A (ja) * 2015-03-19 2020-10-01 パナソニックＩｐマネジメント株式会社 通信方法及び非レガシ通信端末
WO2017116137A1 (fr) * 2015-12-29 2017-07-06 엘지전자 주식회사 Procédé de fonctionnement dans un système de réseau local sans fil, et appareil pour la mise en oeuvre dudit procédé
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JP2019036997A (ja) * 2018-11-05 2019-03-07 パナソニック株式会社 Ｐｃｐ／ａｐ装置、端末装置およびこれらの通信方法
JP2020043606A (ja) * 2019-12-05 2020-03-19 パナソニック株式会社 Ｐｃｐ／ａｐ装置、端末装置およびこれらの通信方法

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