1. A method for updating an air interface key, comprising:
a core network node receiving a relocation indication message, wherein the relocation indication message is configured to indicate a User Equipment (UE) to be ready to relocate to a target Radio Network Controller (RNC) from a source RNC;
using a key parameter to calculate a next hop enhanced key; and
sending the next hop enhanced key to the target RNC.
2. The method according to claim 1, wherein the key parameter comprises at least one of: a current enhanced key, an intermediate key and a traditional key.
3. The method according to claim 2, further comprising:
the target RNC using the next hop enhanced key to communicate with the UE.
4. The method according to claim 3, wherein the step that the target RNC uses the next hop enhanced key to communicate with the UE comprises:
the target RNC using the next hop enhanced key as the current enhanced key, and using the current enhanced key to communicate with the UE.
5. The method according to claim 1, wherein the core network node comprises: a source core network node, or, a target core network node.
6. The method according to claim 1, wherein the relocation indication message comprises: a relocation demand message sent to a source core network node by the source RNC, or, a transfer relocation request message sent to a target core network node by the source core network node.
7. The method according to claim 1, wherein the step of sending the next hop enhanced key to the target RNC comprises:
the core network node sending the next hop enhanced key to the target RNC through a relocation request message andor a transfer relocation request message.
8. The method according to claim 7, wherein the core network node puts a ciphering key CKU of the next hop enhanced key in a CK field of the relocation request message andor the CK field of the transfer relocation request message, and puts an integrity key IKU of the next hop enhanced key in an IK field of the relocation request message andor the IK field of the transfer relocation request message, to send to the target RNC.
9. The method according to claim 1, wherein the core network node is provided with a network Next hop Chaining Counter (NCC), configured to count number of times that the core network node calculates the next hop enhanced key; and the core network node progressively increases the network NCC before or after the step of using the key parameter to calculate the next hop enhanced key.
10. The method according to claim 9, wherein the UE is provided with a terminal NCC, configured to count number of times that the UE calculates the next hop enhanced key; and
after the step of sending the next hop enhanced key to the target RNC, the method further comprises:
the target RNC or the core network node sending information about the network NCC to the UE;
the UE determining whether the terminal NCC corresponding to an activated current enhanced key is equal to the network NCC;
if yes, the UE using the current enhanced key corresponding to the terminal NCC to communicate with the target RNC; and
if no, the UE calculating the next hop enhanced key and progressively increasing the corresponding terminal NCC until the terminal NCC is equal to the network NCC, and using the next hop enhanced key corresponding to the terminal NCC which is equal to the network NCC to communicate with the target RNC.
11. The method according to claim 1, wherein the relocation indication message contains a traditional key, the traditional key comprises: a mapped traditional key or a current enhanced key of the source RNC, the current enhanced key comprises a current enhanced ciphering key CKU andor a current enhanced integrity key IKU, and the mapped traditional key comprises a mapped ciphering key CK\u2032 andor a mapped integrity key IK\u2032.
12. The method according to claim 11, wherein the source RNC puts the CKU or the CK\u2032 in a CK field of the relocation indication message, and puts the IKU or the IK\u2032 in an IK field of the relocation indication message, to send to the core network node.
13. The method according to claim 1, wherein the source RNC and the target RNC are a same RNC.
14. A core network node, comprising:
a receiving module, configured to receive a relocation indication message, wherein the relocation indication message is configured to indicate a User Equipment (UE) to be ready to relocate to a target Radio Network Controller (RNC) from a source RNC;
a calculating module, configured to use a key parameter to calculate a next hop enhanced key; and
a sending module, configured to send the next hop enhanced key to the target RNC.
15. The core network node according to claim 14, wherein the key parameter comprises at least one of: a current enhanced key, an intermediate key and a traditional key.
16. The core network node according to claim 14, wherein the relocation indication message comprises: a relocation demand message sent to a source core network node by the source RNC, or, a transfer relocation request message sent to a target core network node by the source core network node; or
the sending module is configured to send the next hop enhanced key to the target RNC through a relocation request message andor a transfer relocation request message; or
the core network node is provided with a network Next hop Chaining Counter (NCC), configured to count number of times that the core network node calculates the next hop enhanced key; and the core network node progressively increases the network NCC before or after the calculating module uses the key parameter to calculate the next hop enhanced key; or
the relocation indication message contains a traditional key, the traditional key comprises: a mapped traditional key or a current enhanced key of the source RNC, the current enhanced key comprises a current enhanced ciphering key CKU andor a current enhanced integrity key IKU, and the mapped traditional key comprises a mapped ciphering key CK\u2032 andor a mapped integrity key IK\u2032.
17.-19. (canceled)
20. A User Equipment (UE), comprising:
a UE receiving module, configured to receive a relocation message, wherein the relocation message is configured to indicate the UE to relocate to the target Radio Network Controller (RNC) from the source RNC; and
a UE calculating module, configured to use a key parameter to calculate a next hop enhanced key, wherein the key parameter comprises at least one of: a current enhanced key, an intermediate key and a traditional key.
21. The UE according to claim 20, further comprising:
a UE communication module, configured to use the next hop enhanced key to communicate with the target RNC.
22. The UE according to claim 20, wherein the UE is provided with a terminal Next hop Chaining Counter (NCC), configured to count number of times that the UE calculates the next hop enhanced key; and
the UE receiving module is further configured to receive information about a network NCC sent by the target RNC or a core network node.
23. The UE according to claim 22, further comprising:
a determination module, configured to determine whether the terminal NCC corresponding to the activated current enhanced key is equal to the network NCC;
a positive result module, configured to, if a determination result of the determination module is yes, use the current enhanced key corresponding to the terminal NCC to communicate with the target RNC; and
a negative result module, configured to, if a determination result of the determination module is no, start the UE calculating module to calculate the next hop enhanced key and progressively increase the corresponding terminal NCC until the terminal NCC is equal to the network NCC, and use the next hop enhanced key corresponding to the terminal NCC which is equal to the network NCC to communicate with the target RNC.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An error correction method for a wireless communication apparatus having a function of relaying a signal transmitted from a transmission station to a receiving station, comprising:
receiving a signal from the transmission station;
subjecting the received signal to an error correction decoding processing;
subjecting the signal after the error correction decoding processing to a hard decision processing;
detecting error of the signal subjected to the hard decision processing;
extracting a soft decision value from a signal which is being subjected to the error correction decoding processing when there is error in the signal subjected to the hard decision processing;
re-coding the extracted soft decision value; and
transmitting the re-coded soft decision value.
2. The error correction method according to claim 1, wherein the soft decision value is extracted based on an iteration number in the extracting process.
3. The error correction method according to claim 1, wherein the soft decision value is extracted based on an iteration time in the extracting process.
4. The error correction method according to claim 1, wherein the error correction decoding processing includes:
calculating bit likelihood of the received signal;
processing the received signal repeatedly to correct error of the signal; and
converting the bit likelihood of the signal which is being subjected to the repetitive processing into the soft decision value.
5. The error correction method according to claim 4, wherein the process of processing the received signal repeatedly to correct the error of the signal includes:
decoding the received signal in a first decoder;
rearranging output data of the first decoder;
decoding an output which is generated by rearranging the output data in a second decoder; and
rearranging output data of the second decoder and returning the rearranged output data of the second decoder to the first decoder.
6. The error correction method according to claim 1, further comprising
determining an iteration number in accordance with ability of the error correction decoding processing at the receiving station.
7. The error correction method according to claim 6, wherein in the process of determining the iteration number, based on iteration number instruction information transmitted from the receiving station, the iteration number is reduced when the ability of the error correction decoding processing at the receiving station is high and the iteration number is increased when the ability of the error correction decoding processing at the receiving station is low.