JP5688766B2 - Mechanism for network multimode operation - Google Patents

Description

  The present invention relates generally to wireless network systems that provide a multi-mode operation mechanism to ensure reliable network communications. Computer programs are also included in the present invention. The present invention can be applied to wireless networks that support role change.

  The multimode relay for the relay reinforcement network is defined in [1]. The defined relay function defines the connection realization between the radio base station and the relay station via the second out-of-band wireless link or the Internet link in addition to the in-band link. Note that the in-band link is used to control the activation / deactivation of the second link.

  Another application of multi-mode relay is to help reduce power consumption. The terminal relay function is made possible by wireless means defined by software. The operation of the relay function of the terminal is determined by a measurement standard such as transmission power or network capacity.

  [1] International Patent Publication WO / 2010/060839

  [1] R.M. Madan, N .; Mehta, A .; Morich, and J.M. Zhang, “Power consumption optimization in multi-mode mobile relay,” (Optimization of power consumption in multimode mobile relay) in European Wireless Technology 2009.

  The present invention relates generally to wireless network systems with network nodes to support multi-mode operation. Network infrastructure nodes may become unusable due to malfunction or disaster. To reliably increase the reliability of the network connection, the alternative role of using the mobile station as a relay station or base station and the base station as a relay station must be supported. The ability to support these multi-mode functions and mechanisms and enable multi-mode operation is described in the present invention. Two schemes are presented, a centralized scheme and a distributed scheme, and the conditions and procedures for initializing the relay mode for the mobile station are described. For the alternative BS function provided by the mobile station, two operation modes including a prevention mode and a reaction mode are described in the present invention.

FIG. 1 shows the relay function of the BS. FIG. 2 shows a centralization scheme for a mobile station operating in relay mode. FIG. 3 shows a message for initial setup of the relay operation in the centralized scheme. FIG. 4 shows a distribution scheme for a mobile station operating in relay mode. FIG. 5 shows a flowchart for the mobile station to initiate base station mode operation.

  1. Initial setting of relay function for mobile station

  Two schemes are defined for the method for the mobile station (MS) to initiate the relay function.

  1) Concentration scheme

  A typical use of the central scheme is shown in FIG. In the centralized scheme, the MS turns on the relay mode based on the assignment from the base station (BS). The origin node A issues a request message REQ_RS to the BS for relay support to the destination node B. The BS must maintain a list of all stations in the cell and determine candidate MSs for relay function support. For example, as shown in FIG. 2, node C is selected as an MS candidate that operates in the relay mode, and the BS requests that the node C operate in the relay mode and relay the message from node A to node B. To node C. The required messages are defined in FIG. A CFM_RS message from node C is returned to the BS to confirm that the request has been accepted. The BS receives the initial setting confirmation of the relay operation, and receives the CFM_RS message and the CFM_RS. Send ID parameter.

  If the MS cannot perform the relay function, an NK_RS message is returned to the BS. The BS searches for another MS candidate that can perform the relay function.

  The origin node A sends an RS_STP message to the MSC to inform the data completion. After receiving the RS_STP message, the MSC turns off the relay mode.

  2) Dispersion scheme

  An example of the use of the dispersion scheme is shown in FIG. If the BS is not available, node A (MS) sends an ENQ_RS message for relay support. According to the destination node in the route table maintained by the MSC, the MSC responds to the node A by the CFM_RS message and turns on the relay mode. When the data transmission is completed, an RS_STP message is transmitted from the originating node A, and the MSC ends the relay mode.

  The following messages are used to support relay mode operation.

  ENQ_RS .. Relay support request, originating node A issues.

  CFM_RS .. Confirms the request in the relay mode and turns on the relay mode.

  CFM_RS. This is a parameter of the ID ·· CFM_RS message and indicates the ID of the node that agrees to accept the relay mode.

  RS_STP .. Origination mode A is issued to indicate transmission completion, and the MS turns off the relay mode after receiving this message.

  2. Mobile station operating in base station mode

  The mobile station has the ability to support base station (BS) functions. The mobile station starts the BS mode only when the base station cannot be used.

  1) Confirmation of BS failure

  A base station failure is confirmed by the following procedure. For simplicity of explanation, MS (1) is used as a one-hop neighbor (neighboring station) of the base station.

  As shown in FIG. 5, it is confirmed whether the BS is usable (step A2). The role of the BS is to connect to the backbone and periodically maintain the network with communication network information. MS (1) is a potential candidate for BS. MS (1) issues REQ_BS when it does not receive a communication message from BS for a certain period of time. REQ_BS. The number is randomly generated (step A4) and sent with the REQ_BS message. If MS (1) cannot detect the BS, it sends REQ_BS and receives REQ_BS from another MS (1). Received REQ_BS. Number and local REQ_BS. The numbers are compared (step A6), and REQ_BS. Using the ID number of the MS (1) having the larger number, CFM_BS. ID is transmitted (step A8-A9). In each MS (1), the local CFM_BS. The counter is incremented. MS (1) is CFM_BS. If the ID is received from the new MS (1), CFM_BS. The counter value increases. CFM_BS. When the counter equals the total number of MS (1) in the cell, MS (1) starts operating as a BS.

  When either MS (1) or MS receives an ENQ_BS or REQ_BS and still maintains a connection with the original BS, an NK_BS message is sent to the MS to inform that the BS is available.

  2) Role change operation mode

  The mobile station changes its role and defines two modes for operating as a base station. That is, the prevention mode and the reaction mode.

  (1) Preventive mode operation

  In the preventive mode, the base station needs to have a candidate list of one-hop mobile station neighbors. Candidates are ranked according to the signal power measured at the base station. The first priority is the mobile station with the maximum power received at the base station. The base station periodically updates this list and sends it periodically. When the base station fails, the first candidate mobile station starts operation in the BS mode.

  (2) Reaction mode operation

  The reaction mode operation defines the following messages:

  ENG_BS: Transmitted by an MS that is not a BS one-hop neighbor, and detects a BS failure.

  REQ_BS: BS mode operation request. Sent by BS one-hop neighbor when BS fails.

  REQ_BS. Number: Random number for BS candidate selection.

  CFM_BS: Approval of operation request in BS mode. Sent by the MS that received the REQ_BS. The MS detects a BS failure.

  CFM_BS. ID: Indicates an ID number of a desirable MS (1) to replace the BS.

  NK_BS: MS (1) request to change to BS is rejected.

Claims (3)

A method implemented in a wireless network system comprising: a condition for initiating a role change function; a scheme for initializing the role change function; and a message used for the role change function;
The role change function is enabled by operating the mobile station as a base station,
The selection of the MS to act as the BS in which the reaction mode is used includes: (a) confirming the availability of the BS; (b) performing polling for the BS's one-hop neighbor; and (c) random polling. Confirming a candidate based on a number.   Said step (a) comprises confirming the failure of the BS, and (a) each BS one-hop neighbor issues a BS inquiry message after the BS connection is lost for a certain period of time; (b) the BS or Canceling the BS query if any BS information has been received from any BS one-hop neighbor; (c) checking the BS for failure when the counter value reaches the total number of BS one-hop neighbors; The method of claim 1, comprising: A computer program for controlling a process for initiating a base station mode of a mobile station, comprising: confirming the presence of a base station,
The base station is undetectable and (a) a random REQ_BS. Generating a number; (b) local REQ_BS. Number and the received REQ_BS. Comparing numbers; (c) large REQ_BS. A computer program comprising increasing a counter value of a candidate having a number; and (d) confirming a base station candidate.

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