Idle Mode Hybrid Mobility Procedure in a Heterogeneous Network

1 . A UE comprising:

a processor configured to perform cell selection or reselection according to a received signal quality criterion that considers both a control channel signal quality and a data channel signal quality.

2 . The UE of claim 1 wherein the processor is further configured to perform the cell selection or reselection according to a cell ranking criterion.

3 . The UE of claim 1 wherein the processor is further configured to perform the cell selection or reselection to one of a low power access node, a pico access node, and a femto access node.

4 . The UE of claim 1 wherein the received signal quality criterion further comprises a path loss based metric.

5 . The UE of claim 4 wherein path loss is defined by a reference signal transmit power level minus a higher layered filtered reference signal received power.

6 . The UE of claim 4 wherein the cell selection or reselection criterion fulfills the criteria defined as Srxlev>0 AND Squal_D>0 AND Squal_C>0, wherein

Srxlev=Q rxlevmeas −( Q rxlevmin +Q rxlevminoffset )− P compensation

Squal — D=Q qualmeasD −( Q qualminD +Q qualminoffsetD )

Squal — C=Q qualmeasC −( Q qualminC +Q qualminoffsetC )

and

Srxlev

is

Cell selection reception power level value (decibels)

Squal_D

is

Cell selection quality value (decibels) for a data

channel

Squal_C

is

Cell selection quality value (decibels) for a control

channel

Q rxlevmeas

is

Measured cell reception power level value

(Reference Signal Received Power)

Q qualmeasD

is

Measured cell quality value (Reference Signal

Received Quality) for a data channel

Q qualmeasC

is

Measured cell quality value (Reference Signal

Received Quality) for a control channel

Q rxlevmin

is

Minimum required reception power level in the cell

(decibels)

Q qualminD

is

Minimum required quality level in the cell (decibels)

for data channel

Q qualminC

is

Minimum required quality level in the cell (decibels)

for a control channel

Q rxlevminoffset

is

Offset to the signaled Q rxlevmin taken into account in

the Srxlev evaluation as a result of a periodic search

for a higher priority public land mobile network

while camped normally in a visited public

land mobile network

Q qualminoffsetD

is

Offset to the signalled Q qualmin D taken into account

in the Squal_D evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Q qualminoffsetC

is

Offset to the signalled Q qualmin C taken into account

in the Squal_C evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Pcompensation

is

max(P EMAX — H − P PowerClass , 0) (decibels)

P EMAX — H

is

Maximum transmission power level a user

equipment uses when transmitting on the uplink in

the cell (decibels) defined as P EMAX — H in [technical

specification 36.101]

P PowerClass

is

Maximum radio frequency output power of the user

equipment (decibels) according to the user

equipment power class as defined in [technical

specification 36.101]

7 . The UE of claim 1 wherein the cell ranking criterion comprises an Rs for a serving cell and an Rn for neighboring cells, and wherein the cell ranking criterion is defined as one of:

R s =PL meas,s +Q Hyst— PL

R n =PL meas,n −Q offset_PL  (2)

or

R s =Q meas,s +Q Hyst

R n =Q meas,n −Q offset1 −Q offset  (8)

where:

PLmeas,s

is

Pathloss measurement quantity in the serving cell used in

cell selection or reselection.

PLmeas,n

is

Pathloss measurement quantity in neighbouring cell used in

cell reselections.

QHyst_PL

is

The hysteresis value for ranking criteria, broadcast in

serving cell system information

Qoffset_PL

is

For intra-frequency: Equals to Qoffset_pls, n, if Qoffset_pls, n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset_pls, n plus

Qoffsetfrequency, if Qoffsets, n is valid, otherwise this equals

to Qoffsetfrequency.

Q meas,s

is

Reference Signal Received Power measurement quantity in

the serving cell used in cell reselections.

Q meas,n

is

Reference Signal Received Power measurement quantity in

the neighbouring cell used in cell selection or reselection.

Qoffset1

is

Defined as the reference signal power difference between

two cells n, s, that is, ReferenceSiganlPower_n −

ReferenceSignalPower_s.

Qoffset

is

For intra-frequency: Equals to Qoffset s,n , if Qoffset s,n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset s,n plus Qoffset frequency ,

if Qoffset s,n is valid, otherwise this equals to Qoffset frequency .

Q_Hyst

is

Specifies the hysteresis value for ranking criteria, broadcast

in serving cell system information

8 . The UE of claim 7 wherein Qoffset1 and Qoffset are used in equation 8 when the UE experiences a certain channel quality condition while Qoffset1 is omitted when the UE experiences another channel quality condition.

9 . The UE of claim 8 , wherein the certain channel quality condition comprises when the channel quality received at the UE is above a threshold.

10 . The UE of claim 8 , wherein the another channel quality condition comprises when the channel quality received at the UE is below a threshold.

11 . The UE of claim 8 , wherein the certain channel quality condition comprises when the UE succeeds in decoding at least one of a control channel and a data channel with a given packet loss rate.

12 . The UE of claim 8 , wherein the another channel quality condition comprises when the UE fails to decode at least one of control channel and data channel with a given packet loss rate.

13 . The UE of claim 1 wherein the cell selection or reselection criteria comprises a biased path loss metric.

14 . The UE of claim 13 wherein the cell selection or reselection criterion fulfills the criteria defined as Srxlev>0 AND Squal_D>0 AND Squal_C>0, wherein

Srxlev=Q rxlevmeas −( Q rxlevmin +Q rxlevminoffset )− P compensation

Squal — D=Q qualmeasD −( Q qualminD +Q qualminoffsetD )

Squal — C=Q qualmeasC −( Q qualminC +Q qualminoffsetC )

and

Srxlev

is

Cell selection reception power level value (decibels)

Squal_D

is

Cell selection quality value (decibels) for a data

channel.

Squal_C

is

Cell selection quality value (decibels) for a control

channel.

Q rxlevmeas

is

Measured cell reception power level value

(Reference Signal Received Power)

Q qualmeasD

is

Measured cell quality value (Reference Signal

Received Quality) for a data channel

Q qualmeasC

is

Measured cell quality value (Reference Signal

Received Quality) for a control channel

Q rxlevmin

is

Minimum required reception power level in the cell

(decibels)

Q qualminD

is

Minimum required quality level in the cell (decibels)

for data control

Q qualminC

is

Minimum required quality level in the cell (decibels)

for a control channel

Q rxlevminoffset

is

Offset to the signaled Q rxlevmin taken into account in

the Srxlev evaluation as a result of a periodic search

for a higher priority public land mobile network

while camped normally in a visited public

land mobile network

Q qualminoffsetD

is

Offset to the signalled Q qualmin D taken into account

in the Squal_D evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Q qualminoffsetC

is

Offset to the signalled Q qualmin C taken into account

in the Squal_C evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Pcompensation

is

max(P EMAX — H − P PowerClass , 0) (decibels)

P EMAX — H

is

Maximum transmission power level a user

equipment uses when transmitting on the uplink in

the cell (decibels) defined as P EMAX — H in [technical

specification 36.101]

P PowerClass

is

Maximum radio frequency output power of the user

equipment (decibels) according to the user

equipment power class as defined in [technical

specification 36.101]

15 . The UE of claim 13 wherein the cell ranking criterion comprises an Rs for a serving cell and an Rn for neighboring cells, and wherein the cell ranking criterion is defined as one of:

R s =Q meas,s +Q Hyst +Q offset1 —s

R n =Q meas,n +Q offset1 n −Q offset  (9)

where:

Q meas,s

is

Reference Signal Received Power measurement quantity in the

serving cell s used in cell reselections.

Q meas,n

is

Reference Signal Received Power measurement quantity in the

neighboring cell n used in cell reselections.

Ooffset1_s

is

Reference Signal Received Power offset value, i.e, Qoffset1_s =

Reference Signal Received Power bias for the serving cell.

Qoffset1_n

is

Reference Signal Received Power offset value, i.e, Qoffset1_n =

Reference Signal Received Power bias for the neighbouring cell.

Qoffset

is

For intra-frequency: Equals to Qoffset s,n , if Qoffset s,n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset s,n plus Qoffset frequency , if

Qoffset s,n is valid, otherwise this equals to Qoffset frequency .

Q_Hyst

is

Specifies the hysteresis value for ranking criteria, broadcast in

serving cell system information

or

R s =Q meas,s +Q Hyst

R n =Q meas,n −Q offset1 —n −Q offset  (10)

where:

Q meas,s

is

Reference Signal Received Power measurement quantity in the

serving cell s used in cell reselections.

Q meas,n

is

Reference Signal Received Power measurement quantity in the

neighbouring cell n used in cell reselections.

Qoffset1_n

is

Defined as the reference of Reference Signal Received Power bias

between two cells s, n, i.e, bias_s − bias_n.

Qoffset

is

For intra-frequency: Equals to Qoffset s,n , if Qoffset s,n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset s,n plus Qoffset frequency , if

Qoffset s,n is valid, otherwise this equals to Qoffset frequency .

Q_Hyst

is

Specifies the hysteresis value for ranking criteria, broadcast in

serving cell system information

16 . The UE of claim 15 wherein Qoffset1 n together with Qoffset are used by the UE to use path loss based cell selection or reselection when a coverage hole is not detected, and where Qoffset is used by the UE to use best power based cell selection or reselection as a fall back mechanism when a coverage hole is detected.

17 . The UE of claim 16 wherein the coverage hole is detected when a packet error rate over a downlink transmission or an uplink transmission is above a predetermined packet error rate, and wherein the coverage hole is also detected when a received signal quality over the downlink transmission or the uplink transmission is above a predetermined received signal quality.

18 . The UE of claim 17 wherein detection of the coverage hole is checked by measuring a success rate or failure rate over one or more downlink or uplink control channels.

19 . The UE of claim 18 wherein the one or more downlink or uplink control channels are configured to assist detection of the coverage hole.

20 . The UE of claim 15 wherein Qoffset1_n and Qoffset are used in Rn criteria (10) when the UE experiences a certain channel quality condition while Qoffset1 is omitted when the UE experiences another channel quality condition.

21 . The UE of claim 20 , wherein the certain channel quality condition comprises when the channel quality received at the UE is above a threshold.

22 . The UE of claim 20 , wherein the another channel quality condition comprises when the channel quality received at the UE is below a threshold.

23 . The UE of claim 20 , wherein the certain channel quality condition comprises when the UE succeeds in decoding at least one of a control channel and a data channel with a given packet loss rate.

24 . The UE of claim 20 , wherein the another channel quality condition comprises when the UE fails to decode at least one of a control channel and a data channel with a given packet loss rate.

25 . A method comprising:

a user equipment (UE) performing one of cell selection or reselection according to a received signal quality criterion that considers both a control channel signal quality and a data channel signal quality.

26 . The method of claim 25 further comprising:

performing the cell selection or reselection according to a cell ranking criterion.

27 . The method of claim 25 further comprising:

performing the cell selection or reselection to one of a low power access node, a pico access node, and a femto access node.

28 . The method of claim 25 wherein the received signal quality criterion further comprises a path loss based metric.

29 . The method of claim 28 wherein path loss is defined by a reference signal transmit power level minus a higher layered filtered reference signal received power.

30 . The method of claim 28 wherein the cell selection or reselection criterion fulfills the criteria defined as Srxlev>0 AND Squal_D>0 AND Squal_C>0, wherein

Srxlev=Q rxlevmeas −( Q rxlevmin +Q rxlevminoffset )− P compensation

Squal — D=Q qualmeasD −( Q qualminD +Q qualminoffsetD )

Squal — C=Q qualmeasC −( Q qualminC +Q qualminoffsetC )

and

Srxlev

is

Cell selection reception power level value (decibels)

Squal_D

is

Cell selection quality value (decibels) for a data

channel

Squal_C

is

Cell selection quality value (decibels) for a control

channel

Q rxlevmeas

is

Measured cell reception power level value

(Reference Signal Received Power)

Q qualmeasD

is

Measured cell quality value (Reference Signal

Received Quality) for a data channel

Q qualmeasC

is

Measured cell quality value (Reference Signal

Received Quality) for a control channel

Q rxlevmin

is

Minimum required reception power level in the cell

(decibels)

Q qualminD

is

Minimum required quality level in the cell (decibels)

for a data channel

Q qualminC

is

Minimum required quality level in the cell (decibels)

for a control channel

Q rxlevminoffset

is

Offset to the signaled Q rxlevmin taken into account

in the Srxlev evaluation as a result of a periodic

search for a higher priority public land

mobile network while camped normally in a

visited public land mobile network

Q qualminoffsetD

is

Offset to the signalled Q qualmin D taken into account

in the Squal_Devaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Q qualminoffsetC

is

Offset to the signalled Q qualmin C taken into account

in the Squal_C evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Pcompensation

is

max(P EMAX — H − P PowerClass , 0) (decibels)

P EMAX — H

is

Maximum transmission power level a user

equipment uses when transmitting on the uplink in

the cell (decibels) defined as P EMAX — H in [technical

specification 36.101]

P PowerClass

is

Maximum radio frequency output power of the user

equipment (decibels) according to the user

equipment power class as defined in [technical

specification 36.101]

31 . The method of claim 25 wherein the cell ranking criterion comprises an Rs for a serving cell and an Rn for neighboring cells, and wherein the cell ranking criterion is defined as one of:

R s =PL meas,s +Q Hyst— PL

R n =PL meas,n −Q offset_PL  (2)

or

R s =Q meas,s +Q Hyst

R n =Q meas,n −Q offset1 −Q offset  (8)

where:

PLmeas

is

Pathloss measurement quantity used in cell reselections.

QHyst_PL

is

The hysteresis value for ranking criteria, broadcast in

serving cell system information

Qoffset_PL

is

For intra-frequency: Equals to Qoffset_pls, n, if Qoffset_pls, n is

valid, otherwise this equals to zero.

For inter-frequency: Equals to Qoffset_pls, n plus

Qoffsetfrequency, if Qoffsets, n is valid, otherwise this equals

to Qoffsetfrequency.

Q meas

is

Reference Signal Received Power measurement quantity

used in cell reselections.

Qoffset1

is

Defined as the reference signal power difference between

two cells n, s, that is, ReferenceSiganlPower_n −

ReferenceSignalPower_s.

Qoffset

is

For intra-frequency: Equals to Qoffset s,n , if Qoffset s,n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset s,n plus Qoffset frequency ,

if Qoffset s,n is valid, otherwise this equals to Qoffset frequency .

Q_Hyst

is

Specifies the hysteresis value for ranking criteria, broadcast

in serving cell system information

32 . The method of claim 31 wherein Qoffset1 and Qoffset are used in equation 8 when the UE experiences a certain channel quality condition while Qoffset1 is omitted when the UE experiences another channel quality condition.

33 . The method of claim 32 , wherein the certain channel quality condition comprises when the channel quality received at the UE is above a threshold.

34 . The method of claim 32 , wherein the another channel quality condition comprises when the channel quality received at the UE is below a threshold.

35 . The method of claim 32 , wherein the certain channel quality condition comprises when the UE succeeds in decoding at least one of a control channel and a data channel with a given packet loss rate.

36 . The method of claim 32 , wherein the another channel quality condition comprises when the UE fails to decode at least one of control channel and data channel with a given packet loss rate.

37 . The method of claim 25 wherein the cell selection or reselection criteria comprises a biased path loss metric.

38 . The method of claim 37 wherein the cell selection or reselection criterion fulfills the criteria defined as Srxlev>0 AND Squal_D>0 AND Squal_C>0, wherein

Srxlev=Q rxlevmeas −( Q rxlevmin +Q rxlevminoffset )− P compensation

Squal — D=Q qualmeasD −( Q qualminD +Q qualminoffsetD )

Squal — C=Q qualmeasC −( Q qualminC +Q qualminoffsetC )

and

Srxlev

is

Cell selection reception power level value (decibels)

Squal_D

is

Cell selection quality value (decibels) for a data

channel

Squal_C

is

Cell selection quality value (decibels) for a control

channel

Q rxlevmeas

is

Measured cell reception power level value

(Reference Signal Received Power)

Q qualmeasD

is

Measured cell quality value (Reference Signal

Received Quality) for data a channel

Q qualmeasC

is

Measured cell quality value (Reference Signal

Received Quality) for a control channel

Q rxlevmin

is

Minimum required reception power level in the cell

(decibels)

Q qualminD

is

Minimum required quality level in the cell (decibels)

for a data channel

Q qualminC

is

Minimum required quality level in the cell (decibels)

for a control channel

Q rxlevminoffset

is

Offset to the signaled Q rxlevmin taken into account in

the Srxlev evaluation as a result of a periodic search

for a higher priority public land mobile network

while camped normally in a visited public

land mobile network

Q qualminoffsetD

is

Offset to the signalled Q qualmin D taken into account

in the Squal_D evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Q qualminoffsetC

is

Offset to the signalled Q qualmin C taken into account

in the Squal_C evaluation as a result of a periodic

search for a higher priority public land mobile

network while camped normally in a visited public

land mobile network

Pcompensation

is

max(P EMAX — H − P PowerClass , 0) (decibels)

P EMAX — H

is

Maximum transmission power level a user

equipment uses when transmitting on the uplink in

the cell (decibels) defined as P EMAX — H in [technical

specification 36.101]

P PowerClass

is

Maximum radio frequency output power of the user

equipment (decibels) according to the user

equipment power class as defined in [technical

specification 36.101]

39 . The method of claim 37 wherein the cell ranking criterion comprises an Rs for a serving cell and an Rn for neighboring cells, and wherein the cell ranking criterion is defined as one of:

R s =Q meas,s +Q Hyst +Q offset1 —s

R n =Q meas,n +Q offset1 n −Q offset  (9)

Q meas,s

is

Reference Signal Received Power measurement quantity in the

serving cell s used in cell reselections.

Q meas,n

is

Reference Signal Received Power measurement quantity in the

neighboring cell n used in cell reselections.

Ooffset1_s

is

Reference Signal Received Power offset value, i.e, Qoffset1_s =

Reference Signal Received Power bias for the serving cell.

Qoffset1_n

is

Reference Signal Received Power offset value, i.e, Qoffset1_n =

Reference Signal Received Power bias for the neighbouring cell.

Qoffset

is

For intra-frequency: Equals to Qoffset s,n , if Qoffset s,n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset s,n plus Qoffset frequency , if

Qoffset s,n is valid, otherwise this equals to Qoffset frequency .

Q_Hyst

is

Specifies the hysteresis value for ranking criteria, broadcast in

serving cell system information

or

R s =Q meas,s +Q Hyst

R n =Q meas,n −Q offset1 —n −Q offset  (10)

where:

Q meas

is

Reference Signal Received Power measurement quantity used in

cell reselections.

Qoffset1_n

is

Defined as the reference of Reference Signal Received Power bias

between two cells s, n, i.e, bias_s − bias_n.

Qoffset

is

For intra-frequency: Equals to Qoffset s,n , if Qoffset s,n is valid,

otherwise this equals to zero.

For inter-frequency: Equals to Qoffset s,n plus Qoffset frequency , if

Qoffset s,n is valid, otherwise this equals to Qoffset frequency .

Q_Hyst

is

Specifies the hysteresis value for ranking criteria, broadcast in

serving cell system information

40 . The method of claim 39 wherein Qoffset1 n together with Qoffset are used by the UE to use path loss based cell selection or reselection when a coverage hole is not detected, and where Qoffset is used by the UE to use best power based cell selection or reselection as a fall back mechanism when a coverage hole is detected.

41 . The method of claim 40 wherein the coverage hole is detected when a packet error rate over a downlink transmission or an uplink transmission is above a predetermined packet error rate, and wherein the coverage hole is also detected when a received signal quality over the downlink transmission or the uplink transmission is above a predetermined received signal quality.

42 . The method of claim 41 wherein detection of the coverage hole is checked by measuring a success rate or failure rate over one or more downlink or uplink control channels.

43 . The UE of claim 42 wherein the one or more downlink or uplink control channels are configured to assist detection of the coverage hole.

44 . The method of claim 39 wherein Qoffset1_n and Qoffset are used in Rn criteria (10) when the UE experiences a certain channel quality condition while Qoffset1 is omitted when the UE experiences another channel quality condition.

45 . The method of claim 44 , wherein the certain channel quality condition comprises when the channel quality received at the UE is above a threshold.

46 . The method of claim 44 , wherein the another channel quality condition comprises when the channel quality received at the UE is below a threshold.

47 . The method of claim 44 , wherein the certain channel quality condition comprises when the UE succeeds in decoding at least one of a control channel and a data channel with a given packet loss rate.

48 . The method of claim 44 , wherein the another channel quality condition comprises when the UE fails to decode at least one of a control channel and a data channel with a given packet loss rate.