TWM295858U - Apparatus for implementing path-based traffic stream admission control in a wireless mesh network - Google Patents

Description

M295858 VIII. New Description: [Technical Field] In summary, the present case relates to a wireless communication system. More specifically, the path-based traffic flow (ts) in the mesh wireless communication network with centralized or decentralized admission control architecture allows the control mechanism. [Background Art] A wireless local area network (WLAN) mesh network is an IEEE80211-based wireless distribution system (WDS), and the wireless distribution system (WDS) includes two or It is more connected to the mesh point (MP) through the ieeE 802.11 link, and communicates through the WLAN mesh service. Figure 1 presents a typical WLAN mesh network 100. The WLAN mesh network 100 includes a plurality of mesh points, MP10, MP 20, MP 30, MP 40, MP 50, MP 60 and MP 70, And multiple gateways A, B and C. Each of the MPs in the WLAN mesh network, ie, MP10, MP 20, MP 30, MP 40, MP 50, MP 60 and MP 70, receives and transmits their own traffic while simultaneously Also serves as a router for other MPs. Gateways A, B and C provide services to MP10, MP 20, MP 30, MP 40, MP 50, MP 60 and MP 70, for example, including providing connection to the Internet, public switched telephone network , PSTN) and other wired or wireless network links. For example, there is no direct data connection between MP50 and gateways A, B or C. The MP50 is connected to Gate A via MP20 and/or MP30. 6 M295858 Still refer to Figure 1, WLAN mesh network 100 uses Ts to allow control to ensure that SWLAN, mesh network allows multiple incoming TSs without sacrificing the current transmission level. The legacy service network ((4) milk.:ork) towel allows new service quality (QoS) TS requests to allow control as long as the resource/service quality (Q〇S) request that the access point (Ap) can support. However, in the network, the allowable control must be determined: this

All MPs in the second path will be able to satisfy the resource/QoS request for the new or new call in the new Ts. Therefore, there is a need for a method and apparatus for implementing road admission control in a wireless mesh network. 4 Basic 4 [New content] This case involves the implementation of the path base Ts in a wireless communication network with distributed and/or centralized access: The wireless mesh network uses a decentralized allowable tool. Field (10) η will be launched for TS - two =; two sources MP / Q 〇 s. This request is propagated through this side of the source of the poor source - the purpose of the MP (D.Mp) and the second way, until the arrival of the intermediate MP can not meet the required allowable path. If you know. When ____ s. suspected defendant mp (s. MP) will request a system from a noon system, a source of the central controller maintains the wireless mesh network V: f to 0: M p the way: f. A singularity/MP in the bandit, and the choice of [^4^ control Μ to satisfy the requested resource / (10). [Specific Besch Mode] Although the features and components of the present invention are described in a specific combination in the preferred embodiment, the features or components can still be used by themselves (in the absence of other features or components). In this case, it may be used in various other ways in combination with other features and elements of the present invention, or may be applied in other various ways that are not combined with other features and elements of the present invention. When referring to the following, the term "MP" includes (but is not limited to) a WTRU, user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, subscriber station (STA) or may be in the wireless Other types of devices operating in the environment. When referring to the following, the term "AP" includes, but is not limited to, a Node B, a base station, a location controller, or other type of interface device that can operate in a wireless environment. This case is a method and device for path-based TS admission control. In a preferred embodiment of the present invention, a WLAN mesh network includes a decentralized admission control architecture. Thus, each MP of the WLAN mesh network shares the responsibility of the control TS to allow for the functionality allowed by the WLAN mesh network control TS with respect to a central location. Figure 2 is a flow diagram of a process 200 for implementing path-based TS admission control in a WLAN mesh network having a decentralized permissible control architecture in accordance with a preferred embodiment of the present invention. In this embodiment, an S.MP initiates the TS through an initial resource/QoS request predetermined to a D.MP. The S.MP transmits an Add TS Request (ADDTS Req) message to the receiving MP in a recognized path up to D.MP (step 210). The receiving MP then determines if the TS can be granted or if the TS can be returned (step 220). If the TS can be granted, then the receiving MP then 8 M295858 decides whether to grant less than the request.

An adjusted or lower Q〇S) (step coffee) G. , /, P source to make the permission of the list to determine the requested capital is not: ^ can meet the f. The scale (four) is the parameter of the next hiding. 疋王口p, they are only exemplary, used in the combination needed. >The number of teas can be used in any month

Time gate = track occupancy: Different Mp measures their channel usage, defined as the percentage of day π 'physical layer sensing medium busy, sensing mechanism to _ s or virtual carrier 2) buffer occupancy: an MP measures it white. Column _ (four). b The access level requested by the user n: The MP measurement re-transmits, the acknowledgment (ack) or the number of frames of the similar person. In a preferred embodiment, the case uses channel occupancy ((3)) to determine if a predetermined MP can satisfy ~ request (four) / (10). Each MP continuously measures c〇 dynamically or at a predetermined interval. If MP(7) can still be maintained below the (3) value after allowing -TS, C〇threshold' will allow the τ§ to pass a predetermined MP. This can be expressed as follows: C〇Current + AC〇< C〇threshold Equation (1) where C0Current is the CO before the TS is allowed, ACO is the change at C0 because TS is allowed, and COthreshold is the predetermined MP. The predetermined or dynamic threshold of the requested resource/QoS will be exceeded and will still be guaranteed. Alternatively, C0 allows parameters to be applied to the predetermined MP via the TS 9 M295858. In this manner, the MP can select an eager C0thresh〇ld for a predetermined TS carrying an instant service, such as Voice over Internet Protocol (VoIP). For decisive admission control, each ts may require a quota as shown below: CO u ACO TM < C0 Equation (2) In both Equations 1 and 2, the calculation of the ACO must take into account the inputs and outputs allowed by the TS. effect. For an intermediate MP, the control allows the MP to still consider the ability of the input TS (i.e., input enable control) and the ability to transmit the output TS (i.e., output enable control). For an s.MP, you only need to consider the output enable control. For a D.MP, only the input admission control needs to be considered. Still referring to Fig. 2, if the receiving MP decides in step 220 that the TS is not allowed (i.e., returned), the receiving MP transmits an ADDTS Resp message back to the S.MP indicating the reason for the return (step 240). The program 200 then returns to step 210 to allow the S.MP to begin the program 200 via the possibly adjusted resource /Q〇s or an alternate allowed path. If the receiving MP allows the TS in step 220, but does not allow the TS with the requested resource/QoS request in step 230, the receiving MP transmits an ADDTS Resp message to indicate an adjustment before returning to step 210 to pass the further action. The s.MP of the resource/QoS offer (step 250). If the request resource /q〇s meets the requirement by receiving the MP in step 230, then it is determined whether the current MP is actually D.MP (step 260). If not, the receiving MP transmits an ADDTS Req message to the next MP in the allowed path, and the program 2 returns to step 220 M295858 to determine the TS grant by the next MP. Optionally, Mp - now sends an ADDTS Resp message to indicate the successful SJVIP (step 265). If the receiving MP is in fact a D.MP, then the D.Mp transmits a Path Allow (PA) Response (pa Resp) message to the S.MP via any path (step 280). The S.MP is now ready to begin a call with the D.MP using the allowed path (step 290). _ Although this is not required, a PA Resp timeout mechanism is preferably implemented in the S.MP. When implementing its timeout mechanism, a timer is initialized and started when the S.MP transmits the ADDTS Req message. And if the PA Resp is not received before a preset timeout threshold, the S·ΜΡ may abandon the ADDTS Req message and selectively transmit another ADDTS Req message along the same or another allowed path. . In contrast, when the S.MP receives the PA Resp, and if the delay request cannot be satisfied, the delay can be measured by the time stamp of the pA Resp and the #TS termination. Figure 3 is a signal flow diagram 'This is an example of the TS allowable control based on the S.MP execution path of a WLAN mesh network 300 having a decentralized admission control architecture. , wherein the intermediate MPs can satisfy a new request resource/Q〇S request, which is generated by an S.MP according to the process 2 of FIG. 2 . The WLAN mesh network 30 includes an S.MP 302, a plurality of intermediate MPSs 304, 306, and a D.MP 308. Each intermediate MP 304, 306 is capable of meeting the resources required by the S.MP / 11 M295858

QoS. The S.MP 302 transmits an ADDTSReq message to the MP 304 to indicate a required resource /Q〇S (step 310). The MP 304 determines that it can conform to the required resource/QoS and transmits an ADDTS Req message to the MP 306 (step 330). The MP 304 can also selectively transmit an ADDTS Resp message back to the S.MP 302 to indicate the success of the TS through the MP 304 (step 320). The MP 306 determines that it can conform to the required resource/QoS of the TS and transmits an ADDTS Req message to the d.MP 308 (step 350). The MP 306 can also selectively transmit an ADDTS Resp message back to the S.MP 302 to indicate the success of the TS through the MP 306 (step 340). The MP 308 determines that it can comply with the requested resource/Q〇S request and transmits a pa Resp message to the S.MP 308 to indicate the allowed path (step 36A), and at the s.MP The call between 302 and the D.MP 308 is now ready to begin (step 370). Figure 4 is a signal flow diagram showing an example of the S.MP execution path-based TS admission control in a WLAN mesh network 400 having a decentralized admission control architecture , wherein the intermediate MPs cannot satisfy the required resource/QoS request of a new ts, and this is generated by an s.MP according to the process 2 of FIG. The WLAN mesh network 4 includes an s. MP 402, a plurality of intermediate MPs 404, 406, 408, and a d.MP 410. The S.MP 402 transmits an ADDTS Req message to the MP 404 to indicate a required resource/QoS (step 420). The MP 404 determines that it can conform to the required resource /Q〇S and transmits an ADDTS Req message to the MP 406 of 12 M295858 (step 430). The MP 404 can also optionally transmit an ADDTS Resp message back to the S.MP 402 to indicate the success of the TS through the MP 404 (step 425). The MP 406 receives the ADDTS Req from the MP 404, but decides that it cannot comply with the required resource / Q〇s of the TS, and transmits an ADDTS Req message to the S.MP 402 to include the rejection. Reason (step 435), (eg, the transmission queue is always full, the required resource exceeds a given limit, does not meet the required resource/Q〇s request, and the like). The ADDTS Resp message transmitted by the MP 406 to the S.MP 402 in step 435 may be relative to a proposal for a modified resource /Q〇s that the MP can allow. Referring to FIG. 4, the ADDTS Resp message is received from the MP 406 according to step 435, and the S.MP 402 determines a heart allow path for excluding the MP 406 because the MP 406 cannot The TS is processed, either because the S.MP 402 is unwilling to reduce its resource/QoS request to conform to the resource/QoS proposed by the MP. The S.MP 402 then transmits another ADDTS Req to the MP 406 to indicate a request resource/QoS and provide a message regarding a new path bypassing the MP 406 (step 440). The MP 404 determines that it can conform to the required resource/QoS and transmits an ADDTS Req message to the MP 408 (step 450). The MP 404 can also selectively transmit an ADDTS Resp message back to the S.MP 402 to indicate the success of the ts through the MP 404 (step 445). The MP 408 determines that it can meet the requested resource of the TS / 13 M295858

QoS and transmits an ADDTS Req message to the D.MP 410 (step 460). The MP 408 can also selectively transmit an ADDTS Resp message back to the S.MP 402 to indicate the success of the TS through the MP 408 (step 455). The MP 410 determines that it can comply with the requested resource/Q〇S request and transmits a PA Resp message to the S.MP 402 to indicate the allowed path (step 465), and at the S.MP 402 and The call of the D.MP 410 is now ready to begin (step 470). • In another embodiment of the present creation, the centralized TS allows the control architecture to be implemented in a WLAN mesh network. In this type of WLAN mesh network, the central controller performs the T§ admission control function on all of the WLAN mesh networks. Figure 5 is a block diagram of a path-based TS admission control performed in a WLAN mesh network having a central controller in accordance with another embodiment of the present invention. When an S.MP wants to create a TS to a D.MP, the S.MP transmits an ADDTS Req message to the central controller, which contains the resources /Q〇S and D.MP identification (step 510). . The ADDTS Req message includes the required resource /qoS and the identification of the d.mp. The central controller selects the best path to satisfy the S Mp desired resource/Q〇S request based on knowledge of control policies and available paths in the mesh network (step 520). And in step 530, a decision is made as to whether the optimal path selected by the central controller satisfies the required resource/QoS required by the S.MP. . If the optimal path selected by the central controller does not satisfy the required resource required by the S.MP / 14 M295858 - Qos' the central controller transmits an increase TS modification (ADDTS Mod) ), the message to the S.MP (step 540). The ADDTS Mod message contains the resources/QoS available for the mesh network currently available. In step 545, a decision will be made as to whether the modified resource/QoS can be received by the S.MP. If the decision at step 545 is affirmative, the routine 500 will then return to step 510 where the S.MP can again transmit a modified resource/#Q〇S request based on the ADDTS Mod message. ADDTS Req message. If the decision is negative, the process 500 terminates. If the selected path can satisfy the S.MP resource/QoS request is determined in step 530, the central control person transmits an add TS acknowledgement (ADDTS grant) message to the S.MP and includes the selected path. All intermediate MPs (Xi 550). Each MP that receives the ADDTS grant determines whether it is 玎 to meet the required resource/QoS (step 560). If the intermediate MPS has any of the MPs that are unable to support the required resources/QoS and cannot satisfy the required resources/Q〇S, then an MS Sense (ADDTS Reject) message is sent to the central The controller indicates that the monthly b-force method meets the required resource /Q〇S. The central controller of the program 500 is then processed in steps 540 and 545 as previously described. If all of the intermediate nodes decide that they can satisfy the required resource /Q〇S in step 560, the call from the S.MP to the one of the ports of the selected path can now begin (step 580). ). Figure 6 is a signal flow diagram of a 15 M295858-TS admission control based on a road in a WLAN, mesh, and 〇〇路6〇〇, wherein the WLAN"mesh network 600 has according to Figure 5 The central operation of the steps allows control of the construction. The WLAN mesh network 600 includes an S.MP 602, an intermediate MP 604, a D.MP 606, and a central controller 608. The S.MP 602 sends an ADDTS Req message to the central controller 608 to request the D.MP 606. A TS (step 610), the central controller 608 checks an internal repository of available resources and determines the load on the different paths between the S.MP 602 and the φ of the D.MP 606. The central controller 608 selects the path with the best resource/QoS metric and updates its resource repository. The central controller 608 sends an ADDTS grant message including a TS ID and a resource/QoS request to the S.MP 602 (step 615), sends an ADDTS grant message to the intermediate MP 604 (step 620), and sends 〆ADDTS approval. The message is to the D.MP 606 (step 625). Upon receiving the ADDTS grant from the central controller 608, the MP 604 and the D.MP 606 collate the available resources. In this example, the MP 604 and the D.MP 606 have the ability to satisfy the # resource/Q〇S request, and a session will immediately start between the S.MP 602 and the D.MP 606 via the intermediate network point MP 604 (steps) 630). However, if the MP 604 and the D.MP 606 or both of them fail to satisfy the required resource/QoS of the ADDTS approval message, the MP 604 and the D.MP 606 will send an ADDTS Rej message to the central station. Controller 608 (steps 635, 640). The MP 604 sends an ADDTS Rej message to the central controller 608 (step 635), which includes the resource/Q〇S that the MP 604 can currently satisfy. Similarly, the D.MP 606 sends an ADDTS Rej message to the central controller 608 (step 16 M295858 - step 640), which includes the resources/QoS that the D.MP 606 can currently satisfy. The central controller 608 updates its resource repository and sends an ADDTS Mod message to the S.MP 602, which contains the best available resources/QoS for a TS sent to the D.MP 606 (steps) 645). The S.MP 602 can then send an ADDTS Req message containing the new resource/QoS request (step 650). These steps are repeated until the resource/QoS that can be satisfied is reached and a session φ begins. Alternatively, in order to release the resources back to the mesh network 600, when a thunder is completed (step 660) 'the S.MP 602 sends a delete TS request (DELTS Req) message to the central controller 608 ( Step 665); the central controller 608 can update its resource database and send a DELTS Req message to the MP 604 to instruct the MP 604 to end the TS (step 670). Similarly, the central controller 608 sends a DELTS Req message to the D.MP 606 to instruct the D.MP 606 to end the session (step 675). • Alternatively, a TS pause mechanism can be used to release resources back to the mesh network 600; for example, when ts is idle for more than a predetermined length of time in a session, the session is terminated and This resource will be released back to the mesh network 600. Figure 7 is a block diagram of an embodiment of an MP700 for performing admission control in a distribution permitting control of a wireless mesh network and/or a central permitting control mesh network. An antenna 7〇5, a receiving state 710, a processor 715, a transmitter 720, and an enable control unit 730, the processor 715 controls the functions of the receiver 71 and the transmitter 17 M295858 720, and Forming an interface with the admission control unit 730, the admission control unit 730 includes a message processor 740, a resource (QoS) manager 750, and a PA message processor 760. In an allocation control wireless mesh network, when the MP 700 is an S.MP or an intermediate MP, the message processor 740 generates an ADDTS Req message. When the MP 700 is used as an intermediate MP, the message processor 740 generates a selective ADDTS Resp message. When a refusal or modification resource/QoS is provided, the message processor 740 notifies the resource (QoS) manager 750 of the provided resource/QoS. In a wireless mesh network using a central admission controller, the message processor 740 generates an ADDTS Req message and an ADDTS Rej message for transmission to the central controller, the message processor 740 further processing by the central controller The resource (QoS) manager 750 that receives the ADDTS approval and ADDTS modification message and notifies the required or provided resource, the resource (QoS) manager 750 determines the available resources of the MP700, such as C0, buffer Occupancy and so on. The resource (QoS) manager 750 determines whether a resource/QoS request for an ADDTS Req message can be satisfied by the MP 700. When TS Special C0 is used to decide whether to allow a TS, the Resource (QoS) Manager 750 determines the C0 of each TS as described above. When the MP 700 is the S.MP of a TS, the resource (QoS) manager 750 further determines the required resources/QoS applied to the ADDTS Req message, and the information provided by the message processor 740 is used. To manage the resources of the MP700 and to make appropriate resource requirements for the other 18 M295858 MPs in the wireless mesh network. In a wireless mesh network using a central admission controller, when the MP 700 is a sMP of a TS that is terminated, a pA message, the processor 760 generates a DELTS Req message for transmission to the central Control state. When the MP7 〇 0 is an intermediate Mp, the pA message processor 76 〇 processes the DELTSReq message received by the central controller. The pA message processing 760 informs the resource (QoS) manager 750 of the released resource.

Among the wireless mesh networks that use the allocation admission control structure, when. When the HP MP700 is the d mp, the pA message processor 76 will generate

ResP message. The PA message processor when the MP700 is the S.MP

760 will also implement any pause mechanism to receive a PA containing the allowed path.

Resp message, as mentioned above. When the Mp7 is the S Mp, when receiving the PA Resp message, the PA message processor 76 notifies the resource of the allocated resource in the allowed path at the beginning of the session (Q processor 750. The block diagram of a central controller for performing ts admission control based on the road (four) basis in a LAN mesh network having a WT ..... τ 讦 讦 control structure. The central control The device is a logical body, which can be implemented in any Mp or made into a separate body: the central controller _ includes an antenna 8〇5, a receiver “Ο, production ^: 815, — The transmitter and the control unit 830. The :: 815 controls the function of the receiver 81 and the transmitter (4), and the (4) unit forms an interface, and the permission control unit 73 includes a packet source 840, a The best path selector 850 and - the message 19 M295858. The processor 860. ' times;: the original shell library 84Q stores the resources of all the MPs in the mesh network, and holds all the existing resources of the Mp / Q〇 S capability, the resource database 840 can be such as an inquiry, a synchronization signal, a beacon response, and by The ADDTS message processor 860 processes the received ADDTSReq message, the ADDTS gift message, and the ADDTS message to obtain resource information. "Hai Best Path Selector 850 calculates the S.MP and the D.MP between The traffic on the same path, based on the calculated traffic, the system operator priority, and the resource/Q〇s request of the TS, the best path selector "o will select the best path and notify the resource accordingly The data processor 84. The message processor 860 generates an ADDTS approval message and an ADDTS modification message respectively according to the ADDTS Req message and the ADDTS Rej message. The message processor 860 notifies when the available resources are reported in the mesh network. And updating the resource database 840. The message processor 860 also generates a DELTS Req message to send to the intermediate MP in response to the delts • Req message received from the S.MP. The message processor 860 notifies the released resource. The resource database 840. The functions of the permission control units 730 and 830 described above may also be integrated into an integrated circuit (1C) or configured as a circuit including a plurality of components connected to each other. In another embodiment of the present invention, the _ADDTS Req message sent by an S.MP includes an Allow Control Mandatory (ACM) block for each access type, and the ACM block allows the intermediate MP to know the Whether the AC requires permission control. If no control is required, the Ts will be 20 M295858

Will be sent directly without resource/QoS guarantee or negotiation, which is low-priority data that does not require the shortest time to send (eg large file send w # X w «v · 1 —· ^ ί . It is especially useful for sending). This case has been modified by people who are familiar with the art, and is not intended to be protected by the scope of the patent application. 21 M295858 [Description of the Drawings] The present invention can be better understood by reference to the preferred embodiments of the following examples, and can be understood in conjunction with the drawings, wherein: Figure 1 shows a typical WLAN mesh. FIG. 2 is a flow chart of a procedure for implementing path-based TS admission control in a WLAN mesh network having a distributed admission control architecture according to a preferred embodiment of the present invention; FIG. 3 is a signal flow diagram , which depicts an example of S.MP implementing path-based TS admission control in a WLAN mesh network with a decentralized admission control architecture, where multiple intermediate MPs can satisfy the method based on Figure 2 A new TS request/QoS request generated by an S.MP, Figure 4 is a signal flow diagram depicting a path-based TS admission control in a WLAN mesh network with a decentralized admission control architecture An S.MP paradigm in which an intermediate MP cannot satisfy a new TS request resource/QoS request generated by an S.MP based on another embodiment of the present invention; FIG. 5 is another preferred embodiment according to the present invention. A program flow chart for implementing path-based TS admission control in a WLAN mesh network with a central controller, and FIG. 6 is a WLAN with a centralized admission control architecture based on the method of FIG. The path-based TS in the mesh network allows control of the 彳 § &5; 5 tiger flowchart, Figure 7 is an exemplary block diagram of the MP, which is used to implement the case 22 M295858 Decentralization allows control of the wireless mesh network and/or concentration allows control of the admission control in both the wireless mesh network; and /^\ Γ-一"% C3 1 -1 1.1 I T7 port", — Ατλτ 1 . Tt /_ γϊ-Π , 1, I-S, S, and the non-targeting of a 呎 呎 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃 圃The path-based TS in the WLAN mesh network allows control.

[Main component symbol description] 100, 400, 600

10 to 70, 700 705, 805 800

A, B, C ADDTS Mod

ADDTS REQ

D.MP

QoS

S.MP

TS PA RESP Mesh Network Dot Antenna Central Controller Gateway Add TS Modification Add TS Request Destination Network Service Quality Source Network Traffic Flow Allow Response 23

Claims (1)

M295858 IX. Patent Application Range: 1. A network point for operation in a wireless mesh network, the network point comprising: an antenna; a transmitter electrically coupled to the antenna for transmitting an admission control message a receiver electrically coupled to the antenna for receiving an enable control message; a processor electrically coupled to the receiver and the transmitter for controlling the receiver and the transmitting And an enabling control unit electrically coupled to the processor, the enabling control unit comprising: a first message processor configured to generate an increased traffic flow message for transmission and processing of the transmitter An increased traffic flow message received by the receiver; • a resource manager configured to determine whether the source of the request/service quality is satisfied based on whether the information provided by the first message processor satisfies a traffic flow a request, and a second message processor, configured to generate a delete traffic stream message for transmission by the transmitter and to process the deletion received by the receiver Traffic flow information. 2. A central controller for operating in a wireless mesh network, wherein the wireless mesh network has a centralized traffic flow control architecture, the central controller comprising: 24 M295858 an antenna; a transmitter electrically coupled to the antenna for transmitting an admission control message; a receiver electrically coupled to the antenna for receiving an admission control message; a processor interfacing with the receiver and the a transmitter electrically coupled for controlling the receiver and the transmitter; and an enable control unit electrically coupled to the processor, the permission control unit comprising: a resource repository configured to store and a plurality of network-related poor source credits in a wireless mesh network; an optimal path selector for selecting an optimal path and correspondingly notifying the resource database; and a message processor configured to generate an increase Traffic flow messages for the transmission of the transmitter and processing of increased traffic flow messages received by the receiver and updating of resource material related to available resources . 25