Detection of invalid channel requests

1. A channel allocation method for use in a telecommunication system, the method comprising:

receiving a channel access request to a radio receiving unit from a mobile station of a telecommunication system;

performing a preprocessing operation on the channel access request using a predefined configuration of devices and algorithms of the radio receiving unit;

computing, during the preprocessing operation, one or more characteristics of the channel access request;

filtering background noise from the channel access request;

comparing the one or more computed characteristics of the channel access request against corresponding one or more detection rules, wherein each of the detection rules is independent of said configuration of the radio receiving unit;

considering the channel access request valid in response to each of the computed characteristics of the channel access request fulfilling the corresponding detection rule; and

outputting the channel access request for channel allocation in response to the channel access request being considered valid.

2. The method of claim 1 , wherein

the computing comprises computing a bit error rate of a training sequence by computing a hard decision of soft values of the training sequence,

the comparing comprises comparing the bit error rate of the training sequence to a threshold that corresponds to a theoretical bit error rate limit of gaussian minimum shift keying where energy per bit to noise density ratio equals zero, and

the considering comprises considering the channel access request fulfilling the detection rule when the threshold is not exceeded.

3. The method of claim 1 , wherein

the computing comprises computing a received signal strength indication of the channel access request,

the comparing comprises comparing the received signal strength indication of the channel access request against a predefined threshold, and

the considering comprises considering the channel access request fulfilling the detection rule when the threshold is not exceeded.

4. The method of claim 1 , wherein

the computing comprises computing a bit error rate of a training sequence by computing a hard decision of soft values of the training sequence and a received signal strength indication of the channel access request;

the comparing comprises comparing the bit error rate of the training sequence to a first threshold that corresponds to a theoretical bit error rate limit of gaussian minimum shift keying, where energy per bit to noise density ratio equals zero, and

comparing the received signal strength indication of the channel access request against a predefined second threshold, and

the considering comprises considering the channel access request as fulfilling the detection rule when the first threshold and the second threshold is not exceeded.

5. A network element, comprising:

a radio receiving unit configured to receive a channel access request from a mobile station of the telecommunication system, said radio receiving unit comprising

a predefined configuration of devices and algorithms to perform pre-processing operations on the channel access request;

a background noise filtering function unit;

a detection function unit configured to

compute, during the preprocessing operation, one or more characteristics of the channel access request,

compare the one or more computed characteristics of the channel access request against corresponding one or more-detection rules, wherein each of the detection rules is independent of said configuration of the radio receiving unit, and

consider a channel access request valid in response to each of the computed characteristics of the channel access request fulfilling the corresponding detection rule; and

an output unit configured to output the channel access request for channel allocation in response to the channel access request being considered valid.

6. The network element of claim 5 , wherein the computed characteristic of the channel access request is configured to correspond to a bit error rate of a training sequence determined by computing a hard decision of soft values of the training sequence, and the detection rule comprises a comparison of the hard decision to a theoretical bit error rate limit of gaussian minimum shift keying, where energy per bit to noise density ratio equals zero.

7. The network element of claim 5 , wherein the computed characteristic of the channel access request is configured to corresponds to a received signal strength indication of the channel access request, and the detection rule comprises a comparison of the received signal strength indication against a predefined threshold.

8. The network element of claim 5 , wherein the detection unit is configured to

determine a first characteristic of the channel access request that corresponds to a bit error rate of a training sequence determined by computing a hard decision of soft values of the training sequence, and a first detection rule comprises a comparison of the hard decision to a theoretical bit error rate limit of gaussian minimum shift keying, where energy per bit to noise density ratio equals zero; and

determine a second characteristic of the channel access request that corresponds to a received signal strength indication of the received channel access request, and a second detection rule comprises a comparison of the received signal strength indication against a predefined threshold.

9. A detection unit, comprising:

connection means for connecting to a radio receiving unit of a network element of a telecommunication system, said radio receiving unit comprising a predefined configuration of devices and algorithms for performing pre-processing operations on bursts received from mobile stations, wherein said detection unit is configured to input from the radio receiving unit a channel access request of a mobile station; compute one or more characteristics of the channel access request; filtering background noise from the channel access request; compare the one or more computed characteristics of the channel access request against corresponding one or more detection rules, wherein each of the detection rules is independent of said configuration of the radio receiving unit, consider a channel access request valid in response to each of the computed characteristics of the channel access request fulfilling the corresponding detection rule, and output the channel access request for channel allocation in response to the channel access request being considered valid.

10. The detection unit of claim 9 , wherein the characteristic of the channel access request corresponds to a bit error rate of a training sequence determined by computing a hard decision of soft values of the training sequence, and the detection rule comprises a comparison of the hard decision to a theoretical bit error rate limit of gaussian minimum shift keying, where energy per bit to noise density ratio equals zero.

11. The detection unit of claim 9 , wherein the characteristic of the channel access request corresponds to a received signal strength indication of the received channel access request, and the detection rule comprises a comparison of the received signal strength indication against a predefined threshold.

12. The detection unit of claim 9 , wherein the detection unit is configured to

obtain a first characteristic of the channel access request that corresponds to bit error rate of a training sequence determined by computing a hard decision of soft values of the training sequence and a first detection rule comprises a comparison of the hard decision to a theoretical bit error rate limit of gaussian minimum shift keying, where energy per bit to noise density ratio equals zero; and

obtain a second characteristic of the channel access request that corresponds to a received signal strength indication of the received channel access request, and the second detection rule comprises a comparison of the received signal strength indication against a predefined threshold.

13. A telecommunication system, comprising:

a mobile station; and

a network element comprising

a radio receiving unit configured to receive a channel access request from a mobile station of the telecommunication system, said radio receiving unit comprising

a predefined configuration of devices and algorithms to perform pre-processing operations on the channel access request;

a background noise filtering function unit;

a detection function unit configured to

compute, during the preprocessing operation, one or more characteristics of the channel access request,

compare the one or more computed characteristics of the channel access request against corresponding one or more detection rules, wherein each of the detection rules is independent of said configuration of the radio receiving unit, and

consider a channel access request valid in response to each of the computed characteristics of the channel access request fulfilling the corresponding detection rule; and

an output unit configured to output the channel access request for channel allocation in response to the channel access request being considered valid,

wherein the computed characteristic of the channel access request is configured to correspond to a bit error rate of a training sequence determined by computing a hard decision of soft values of the training sequence, and the detection rule comprises a comparison of the hard decision to a theoretical bit error rate limit of gaussian minimum shift keying, where energy per bit to noise density ratio equals zero.

14. A computer program product encoding a computer program of instructions for executing a computer process for detection of invalid channel access requests, the computer process comprising:

receiving a channel access request to a radio receiving unit from a mobile station of a telecommunication system;

performing a pre-processing operation on the channel access request using a predefined configuration of devices and algorithms of the radio receiving unit;

filtering background noise from the channel access request;

computing, during the preprocessing operation, one or more characteristics of the channel access request;

comparing the one or more computed characteristics of the channel access request against corresponding one or more detection rules, wherein each of the detection rules is independent of said configuration of the radio receiving unit;

considering the channel access request valid in response to each of the computed characteristics of the channel access request fulfilling the corresponding detection rule; and

outputting the channel access request for channel allocation in response to the channel access request being considered valid.