Patent Application
20090232060
Not applicable.
1. Field of the Invention
The present invention relates to a method, a wireless communication system, a communication apparatus, and a tangible machine-readable medium for establishing a routing path. More specifically, the present invention relates to a method, a wireless communication system, a communication apparatus, and a tangible machine-readable medium for establishing a routing path during a network entry process of a subscriber station (SS) based on a multi-hop relay standard.
2. Descriptions of the Related Art
Although the IEEE 802.16 standard already provides greater bandwidths, lower building cost, better service quality and expansibility, there still exist some defects of coverage and signal quality of the IEEE 802.16 standard. Therefore, the IEEE 802.16j standard working group established a multi-hop relay study group in July, 2005 for building a multi-hop relay standard.
In conventional IEEE 802.16 standard, network entry process is easily to execute because a base station (BS) and a plurality of subscriber stations (SSs) transmit data to each other directly. But in the multi-hop relay standard, such as the IEEE 802.16j standard or the IEEE 802.16m standard, there are relay stations (RSs) to relay data between the BS and the SSs. Accordingly, the routing paths between the BS and the SSs are more complicated because of data's relay, so that the network entry process will be more difficult between the BS and the SSs.
When an SS, such as a mobile station (MS), enters into a multi-hop relay stations (MR-RSs) network under the IEEE 802.16j during a network entry process, a solution to choosing and/or managing routing paths of the MR-RSs network under the IEEE 802.16j standard which transmit data from a BS to the SS is desired.
One objective of this invention is to provide a method for establishing a routing path during a network entry process of an SS based on a multi-hop relay standard. The method comprises the following steps: transmitting a ranging request (RNG-REQ) of the SS with a ranging connection identification (CID) from the SS to an RS; allocating an SS CID for the SS; transmitting a ranging response (RNG-RSP) having the SS CID with the ranging CID from the RS to the SS; transmitting a request message with the SS CID from the SS to a BS through the RS; and transmitting a response message from the BS to the SS through the RS after receiving the request message. The routing path of the SS is updated into a routing table of the RS according to one of the request message and the response message.
Another objective of this invention is to provide a wireless communication system for establishing a routing path during a network entry process of an SS based on a multi-hop relay standard. The wireless communication system comprises a BS, an SS, and an RS. The SS transmits an RNG-REQ of the SS to the RS with a ranging CID. The RS allocates an SS CID for the SS, and transmits an RNG-RSP having the SS CID to the SS with the ranging CID. Then the SS transmits a request message with the SS CID to the BS through the RS. Finally, the BS transmits a response message to the SS through the RS after receiving the request message. The routing path of the SS is updated into a routing table of the RS according to one of the request message and the response message.
Another objective of this invention is to provide a communication apparatus for establishing a routing path during a network entry process of an SS based on a multi-hop relay standard. The communication apparatus comprises a receiving module, a memory, a processor, and a transmitting module. The receiving module receives a request message or a response message. The memory stores a routing table.
In one way, when the receiving module receives the request message, such as an SS basic capability request (SBC-REQ), the processor processes the request message to retrieval SS information having an SS CID and the routing path of the SS, and to update the SS CID and the routing path of the SS into the routing table. The transmitting module transmits the request message with the SS CID to the BS.
In the other way, when the receiving module receives the response message, such as an SS basic capability response (SBC-RSP), which has an SS CID and the routing path of the SS, the processor updates the SS CID and the routing path of the SS into the routing table after receiving the response message. Finally, the transmitting module transmits the response message with an RS CID to the SS.
Another objective of this invention is to provide a tangible machine-readable medium having executable code to cause a machine to perform a method for establishing a routing path during a network entry process of an SS based on a multi-hop relay standard. The method comprises the following steps: transmitting an RNG-REQ of the SS with a ranging CID from the SS to an RS; allocating an SS CID for the SS; transmitting an RNG-RSP having the SS CID with the ranging CID from the RS to the SS; transmitting a request message with the SS CID from the SS to a BS through the RS; and transmitting a response message from the BS to the SS through the RS after receiving the request message. The routing path of the SS is updated into a routing table of the RS according to one of the request message and the response message.
The aforesaid method can be executed by wireless communication apparatus, such as a BS or an RS in the wireless communication system. By receiving a request message (i.e. SBC-REQ) or a response message (i.e. SBC-RSP) and updating the SS CID and the routing path of the SS into a routing table which is stored in the RS, this invention can choose and/or manage routing paths of the RS of the wireless communication system. Thus, data of the wireless communication system based on a multi-hop relay standard can be transmitted successfully among the BS, RSs, and SSs.
The detailed technology and preferred embodiments implemented for the subject invention are described in the following paragraphs accompanying the appended drawings for people skilled in this field to well appreciate the features of the claimed invention.
As illustrated in
In
Then, the SS 107 transmits one request message, such as an SBC-REQ SBCM-r2 with the SS basic CID to the RS2 105, the RS2 105 transmits another request message, such as an SBC-REQ SBCr2-r1 which comprises the SS information (i.e. SS MAC address) with the SS basic CID to the RS1 103, and the RS1 103 transmits the other request message, such as an SBC-REQ SBCr1-B which comprises the SS information with the SS basic CID to the BS 101.
After processing the SBC-REQ SBCr1-B, the BS 101 transmits one response message, such as an SBC-RSP SBCB-r1 which comprises the SS basic CID, the SS primary CID, and a routing path of the SS 107 with HMAC/CMAC with an RS1 CID to the RS1 103. After that, the RS1 103 transmits another response message, such as an SBC-RSP SBCr1-r2 which comprises the SS basic CID and the SS primary CID with HMAC/CMAC with an RS2 CID to the RS2 105. Finally, the RS2 105 transmits the other response message, such as an SBC-RSP SBCr2-M to the SS 107 with the SS basic CID.
There are two ways to update the SS basic CID, the SS primary CID, and the routing path of the SS 107 into a routing table which is stored in the memory 207 of the RS1 103. One way is that the processor 203 of the RS1 103 processes the SBC-REQ SBCr2-r1 to retrieval the SS information. Then the RS1 103 updates the SS basic CID, the SS primary CID, and the routing path of the SS 107 into the routing table according to the SBC-REQ SBCr2-r1 and the SS information.
Another way is that the RS1 103 updates the SS basic CID, the SS primary CID, and the routing path of the SS 107 into the routing table according to the SBC-RSP SBCB-r1 and the SS information after the receiving module 201 of the RS1 103 receives the SBC-RSP SBCB-r1.
After the routing table of the RS1 103 is updated, a timer 209 of the RS1 103 starts a timeout period to wait the BS 101 to transmit a dynamic service addition request (DSA-REQ). Similarly, a timer 209 of the RS2 105 starts another timeout period to wait the BS 101 to transmit a DSA-REQ through the RS1 103.
This invention is not limited that only the routing table the RS1 103 is updated, any other RSs (i.e. RS2 105) in the multi-hop relay wireless communication system 1 also can update the routing table thereof as the operations described in the above description. Those skilled in the art can understand the corresponding operations of the update of the routing table by the explanation of the first embodiment.
Second, the SS 107 transmits a PKM-REQ PKMM-r2 with the SS primary CID to the RS2 105, the RS2 105 transmits a PKM-REQ PKMr2-r1 with the SS primary CID to the RS1 103, and the RS1 103 transmits a PKM-REQ PKMr1-B with the SS primary CID to the BS 101. After processing the PKM-REQ PKMr1-B, the BS 101 transmits a PKM-RSP PKMB-r1 with the SS primary CID to the RS1 103, the RS1 103 transmits a PKM-RSP PKMr1-r2 with the SS primary CID to the RS2 105, and the RS2 105 transmits a PKM-RSP PKMr2-M with the SS primary CID to the SS 107.
Third, the SS 107 transmits an REG-REQ REGM-r2 with HMAC/CMAC with the SS primary CID to the RS2 105, the RS2 105 transmits an REG-REQ REGr2-r1 with HMAC/CMAC with the SS primary CID to the RS1 103, and the RS1 103 transmits an REG-REQ REGr1-B with HMAC/CMAC with the SS primary CID to the BS 101. After processing the REG-REQ REGr1-B, the BS 101 transmits an REG-RSP REGB-r1 with HMAC/CMAC with the SS primary CID to the RS1 103, the RS1 103 transmits an REG-RSP REGr1-r2 with HMAC/CMAC with the SS primary CID to the RS2 105, and the RS2 105 transmits an REG-RSP REGr2-M with HMAC/CMAC with the SS primary CID to the SS 107.
Finally, the BS 101 transmits a DSA-REQ DSAB-r1 which comprises the SS basic CID with HMAC/CMAC with the RS2 primary CID to the RS1 103 and the RS1 103 transmits a DSA-REQ DSAr1-r2 which comprises the SS basic CID with HMAC/CMAC with the RS2 primary CID to the RS2 105. If the RS1 103 receives the DSA-REQ DSAB-r1 in the timeout period which is started by the timer 209 of the RS1 103, the SS basic CID, the SS primary CID, and the routing path of the SS 107 stored in the routing table of the RS1 103 will be kept. Otherwise, if the RS1 103 receives the DSA-REQ DSAB-r1 out of the timeout period which is started by the timer 209 of the RS1 103, the SS basic CID, the SS primary CID, and the routing path of the SS 107 stored in the routing table of the RS1 103 will be removed.
A second embodiment of this invention is a method for establishing a routing path during a network entry process of an SS based on a multi-hop relay standard, which is a method applied to the multi-hop relay wireless communication system 1 described in the first embodiment. More specifically, the method of the second embodiment which is illustrated in
In step 401, an RNG-REQ of the SS, such as the SS 107, is transmitted with a ranging CID from the SS to an RS, Next in step 403, an SS CID for the SS is allocated by the RS. In step 405, an RNG-RSP having the SS CID is transmitted with the ranging CID from the RS to the SS. Then, in step 407, a request message (i.e. SBC-REQ) is transmitted with the SS CID from the SS to a BS, such as the BS 101, through the RS. Finally, in step 409, a response message (i.e. SBC-RSP) is transmitted from the BS to the SS through the RS after the request message is received.
One way to update the SS basic CID, the SS primary CID, and the routing path of the SS, step 407 further comprises some steps illustrated in
Another way to update the SS basic CID, the SS primary CID, and the routing path of the SS, step 409 further comprises some steps illustrated in
In addition to the steps revealed in
Accordingly, by receiving an SBC-REQ or an SBC-RSP, and updating the SS CID and the routing path of the SS into a routing table which is stored in the RS, this invention can choose and/or manage relay paths of the RS of the wireless communication system. Thus, data of the wireless communication system based on a multi-hop relay standard can be transmitted successfully among the BS, RSs, and SSs.
The above disclosure is related to the detailed technical contents and inventive features thereof. People skilled in this field may proceed with a variety of modifications and replacements based on the disclosures and suggestions of the invention as described without departing from the characteristics thereof. Nevertheless, although such modifications and replacements are not fully disclosed in the above descriptions, they have substantially been covered in the following claims as appended.
