Cell reselection method and mobile terminal
Embodiments of the present invention provide a cell reselection method and a mobile terminal. The method includes: in a process of cell reselection, if learning through determining that a current serving cell is a high-quality cell, choosing to continue to camp on the serving cell, where the high-quality cell is a cell satisfying a determining rule for promoting a cell to a high-quality cell. According to the embodiments of the present invention, a cell satisfying a determining rule for promoting a cell to a high-quality cell is managed as a high-quality cell, and in a process of cell reselection, if a current serving cell is a high-quality cell occurs, a processing manner of continuing to camp on the current serving cell is selected, reducing frequent handovers between cells, improving service quality of a service, and reducing power consumption of a mobile terminal.
1. A cell reselection method, comprising:
in a process of cell reselection, performing cell measurement on a current serving cell to obtain measurement parameters, wherein the measurement parameters comprise a camping time in which the current serving cell has been camped on until the cell measurement is performed, and signal quality and signal strength of the current serving cell when the cell measurement is performed, wherein correspondingly, the determining rule is:
according to the camping time, the signal quality and the signal strength, and respective corresponding weights, acquiring a reference value corresponding to the current serving cell and determining whether the reference value reaches a predetermined value;
comparing the measurement parameters to a determining rule;
upon the current serving cell satisfying the determining rule, identifying the serving cell as a high-quality cell; and
upon identifying the current serving cell as a high-quality cell, continuing to camp on the current serving cell regardless of availability of high-quality neighboring cells.
2. The method according to claim 1 , wherein the determining rule is in a one-to-one correspondence with a cell standard, wherein
a determining rule corresponding to a WCDMA cell is that a reference value Q ex reaches a predetermined value Q max , wherein
Q
ex
=
Min
(
t
T
std
×
∂
1
,
∂
1
)
+
Min
(
Q
qual
max
-
Q
qualmeas
Q
qual
max
-
Q
qualstd
×
∂
2
,
∂
2
)
+
Min
(
(
Q
rscp
max
-
Q
rscpmeas
Q
rscp
max
-
Q
rscpstd
)
×
∂
3
,
∂
3
)
,
wherein
∂ 1 , ∂ 2 , and ∂ 3 are the weights respectively occupied by the camping time, the signal quality, and the signal strength, and satisfy ∂ 1 +∂ 2 +∂ 3 =1, ∂ 1 ≧0, ∂ 2 ≧0, and ∂ 3 ≧0; T std is a reference time length for promoting a cell to a high-quality cell, t is the camping time; Q qualstd is a reference value of a signal to noise ratio Ec/No, Q qualmeas is an actual measured value of the Ec/No; Q rscpstd is a reference value of received signal code power (RSCP), and Q rscpmeas is an actual measured value of the RSCP; and
Q qual max and Q rscp max are both preset maximum values, and Q max ≦1.
3. The method according to claim 1 , wherein the determining rule is in a one-to-one correspondence with a cell standard, wherein
a determining rule corresponding to a GSM cell is that a reference value Q ex reaches a predetermined value Q max , wherein
Q
ex
=
Min
(
t
T
std
×
∂
4
,
∂
4
)
+
Min
(
Q
rxlev
max
-
Q
rxlevmeas
Q
rxlev
max
-
Q
rxlevstd
×
∂
5
,
∂
5
)
+
Min
(
(
SNR
max
-
SNR
meas
SNR
max
-
SNR
std
)
×
∂
6
,
∂
6
)
,
wherein
∂ 4 , ∂ 5 , and ∂ 6 are the weights respectively occupied by the camping time, the signal strength, and a signal to noise ratio, and satisfy ∂ 4 +∂ 5 +∂ 6 =1, ∂ 4 ≧0, ∂ 5 ≧0, and ∂ 6 ≧0; T std is a reference time length for promoting a cell to a high-quality cell, t is the camping time; Q rxlevstd is a reference value of received signal strength indicator (RSSI), Q rxlevmeas is an actual measured value of the RSSI; SNR std is a reference value of the signal to noise ratio, and SNR meas is an actual measured value of the signal to noise ratio; and
Q rxlev max and SNR max are both preset maximum values, and Q max ≦1.
4. The method according to claim 1 , further comprising:
in the process of the cell reselection, upon determining that the current serving cell is not a high-quality cell, continuing to determine whether a neighboring cell is a high-quality cell, if the neighboring cell is a high-quality cell, determining whether the neighboring cell used as a high-quality cell satisfies a camping condition, and if the neighboring cell is a high-quality cell, handing over to the neighboring cell used as a high-quality cell, wherein
if the neighboring cell is a WCDMA cell, a corresponding camping condition comprises:
Q qualmeas >Q qual min && Q rscpmeas >Q rscp min && last t min seconds, wherein
Q qualmeas is an actual measured value of a signal to noise ratio Ec/No corresponding to the neighboring cell, Q rscpmeas is an actual measured value of received signal code power (RSCP) corresponding to the neighboring cell, Q qual min and Q rscp min are both minimum preset access values for being a high-quality cell, and t min represents minimum duration in which Q qualmeas >Q qual min and Q rscpmeas >Q rscp min are both satisfied.
5. The method according to claim 1 , further comprising:
in the process of the cell reselection, upon determining that the current serving cell is not a high-quality cell, continuing to determine whether a neighboring cell is a high-quality cell, if the neighboring cell is a high-quality cell, determining whether the neighboring cell used as a high-quality cell satisfies a camping condition, and if the neighboring cell is a high-quality cell, handing over to the neighboring cell used as a high-quality cell, wherein
if the neighboring cell is a GSM cell, a corresponding camping condition comprises:
Q rxlevmeas >Q rxlev min && lasts t min seconds, wherein
Q rxlevmeas is an actual measured value of received signal strength indicator (RSSI) corresponding to the neighboring cell, Q rxlev min is a preset minimum access value for being a high-quality cell, and t min represents minimum duration in which Q rxlevmeas >Q rxlev min is satisfied.
6. The method according to claim 1 , wherein identifying a target cell as a high-quality cell comprises:
dividing a database into multiple partitions according to cell standards, and storing a cell identity of the target cell in a partition of a corresponding standard.
7. A mobile terminal, comprising:
a processor; and
a memory storing computer program instructions which, when executed by the processor, perform operations comprising:
in a process of cell reselection, performing cell measurement on a current serving cell to obtain measurement parameters, wherein the measurement parameters comprise a camping time in which the serving cell has been camped on until the cell measurement is performed, and signal quality and signal strength of the serving cell when the cell measurement is performed, wherein correspondingly, the determining rule is:
according to the camping time, the signal quality and the signal strength, and respective corresponding weights, acquiring a reference value corresponding to the serving cell and determining whether the reference value reaches a predetermined value;
comparing the measurement parameters to a determining rule;
upon the current serving cell satisfying the determining rule, identifying the current serving cell as a high-quality cell; and
upon identifying the current serving cell as a high-quality cell, continuing to camp on the current serving cell regardless of availability of high-quality neighboring cells.
8. The mobile terminal according to claim 7 , wherein the determining rule is in a one-to-one correspondence with a cell standard, wherein
a determining rule corresponding to a WCDMA cell is that a reference value Q ex reaches a predetermined value Q max , wherein
Q
ex
=
Min
(
t
T
std
×
∂
1
,
∂
1
)
+
Min
(
Q
qual
max
-
Q
qualmeas
Q
qual
max
-
Q
qualstd
×
∂
2
,
∂
2
)
+
Min
(
(
Q
rscp
max
-
Q
rscpmeas
Q
rscp
max
-
Q
rscpstd
)
×
∂
3
,
∂
3
)
,
wherein
∂ 1 , ∂ 2 , and ∂ 3 are the weights respectively occupied by the camping time, the signal quality, and the signal strength, and satisfy ∂ 1 +∂ 2 +∂ 3 =1, ∂ 1 ≧0, ∂ 2 ≧0, and ∂ 3 ≧0; T std is a reference time length for promoting a cell to a high-quality cell, t is the camping time; Q qualstd is a reference value of a signal to noise ratio Ec/No, Q qualmeas is an actual measured value of the Ec/No; Q rscpstd is a reference value of received signal code power (RSCP), and Q rscpmeas is an actual measured value of the RSCP; and
Q qual max and Q rscp max are both preset maximum values, and Q max ≦1.
9. The mobile terminal according to claim 7 , wherein the determining rule is in a one-to-one correspondence with a cell standard, wherein
a determining rule corresponding to a GSM cell is that a reference value Q ex reaches a predetermined value Q max , wherein
Q
ex
=
Min
(
t
T
std
×
∂
4
,
∂
4
)
+
Min
(
Q
rxlev
max
-
Q
rxlevmeas
Q
rxlev
max
-
Q
rxlevstd
×
∂
5
,
∂
5
)
+
Min
(
(
SNR
max
-
SNR
meas
SNR
max
-
SNR
std
)
×
∂
6
,
∂
6
)
,
wherein
∂ 4 , ∂ 5 , and ∂ 6 are the weights respectively occupied by the camping time, the signal strength, and a signal to noise ratio, and satisfy ∂ 4 +∂ 5 +∂ 6 =1, ∂ 4 ≧0, ∂ 5 ≧0, and ∂ 6 ≧0; T std is a reference time length for promoting a cell to a high-quality cell, t is the camping time; Q rxlevstd is a reference value of received signal strength indicator (RSSI), Q rxlevmeas is an actual measured value of the RSSI; SNR std is a reference value of the signal to noise ratio, and SNR meas is an actual measured value of the signal to noise ratio; and
Q rxlev max and SNR max are both preset maximum values, and Q max ≦1.
10. The mobile terminal according to claim 7 , wherein the operations further comprise:
in the process of the cell reselection, upon determining that the current serving cell is not a high-quality cell, continuing to determine whether a neighboring cell is a high-quality cell, if the neighboring cell is a high-quality cell, determining whether the neighboring cell used as a high-quality cell satisfies a camping condition, and if the neighboring cell is a high-quality cell, handing over to the neighboring cell used as a high-quality cell, wherein
if the neighboring cell is a WCDMA cell, a corresponding camping condition comprises:
Q qualmeas >Q qual min && Q rscpmeas >Q rscp min && last t min seconds, wherein
Q qualmeas is an actual measured value of a signal to noise ratio Ec/No corresponding to the neighboring cell, Q rscpmeas is an actual measured value of received signal code power (RSCP) corresponding to the neighboring cell, Q qual min and Q rscp min are both minimum preset access values for being a high-quality cell, and t min represents minimum duration in which Q qualmeas >Q qual min and Q rscpmeas >Q rscp min are both satisfied.
11. The mobile terminal according to claim 7 , wherein the operations further comprise:
in the process of the cell reselection, upon determining that the current serving cell is not a high-quality cell, continuing to determine whether a neighboring cell is a high-quality cell, if the neighboring cell is a high-quality cell, determining whether the neighboring cell used as a high-quality cell satisfies a camping condition, and if the neighboring cell is a high-quality cell, handing over to the neighboring cell used as a high-quality cell, wherein
if the neighboring cell is a GSM cell, a corresponding camping condition comprises:
Q rxlevmeas >Q rxlev min && lasts t min seconds, wherein
Q rxlevmeas is an actual measured value of received signal strength indicator (RSSI) corresponding to the neighboring cell, Q rxlev min is a preset minimum access value for being a high-quality cell, and t min represents minimum duration in which Q rxlevmeas >Q rxlev min is satisfied.
12. The mobile terminal according to claim 7 , wherein the operations further comprise:
dividing a database into multiple partitions according to cell standards, and storing a cell identity of a target cell in a partition of a corresponding standard.