Method for cell reselection of a wireless communication device
A method for operating a wireless communication device in a cellular network comprises the steps of: determining power consumption criteria for at least one first time period containing at least one data transmission, carrying out a data transmission session, in case that after said data transmission session the wireless communication device has changed from a first base node to a second base node of the cellular network: determining power consumption criteria for at least one second time period containing at least one data transmission on a second base node, comparing power consumption criteria of the first time period with power consumption criteria of the second time period, carrying out a cell reselection to the first base node, in case at the first time period the determined power consumption criteria indicate a lower power consumption than at the second time period.
1. Method for operating a wireless communication device in a cellular network by operating with a first base node of the cellular network, the method comprises the steps for the wireless communication device of:
operating the wireless communication device in enhanced coverage mode;
determining power consumption criteria, based on at least coverage enhancement repetitions, associated with at least one first time period containing at least one data transmission,
after carrying out a data transmission session, switching the wireless communication device from operating with the first base node to operating with a second base node of the cellular network;
determining power consumption criteria, based on at least coverage enhancement repetitions, associated with at least one second time period containing at least one data transmission on the second base node, wherein said second time period occurs after said first time period and is equal in length to the first time period;
comparing the power consumption criteria, based on the at least coverage enhancement repetitions, associated with the first time period, with the power consumption criteria, based on the at least coverage enhancement repetitions, associated with the second time period;
upon determining, based on said comparison, that the power consumption criteria, associated with the first time period, indicates a lower power consumption than that associated with the second time period, carrying out a cell reselection to the first base node.
2. Method according to claim 1 , wherein the switch from the first base node to the second base node is carried out in response to a reception of a re-direction signal transmitted from the first base node.
3. Method according to claim 1 , wherein the switch from the first base node to the second base node is carried out in response to neighbor cell measurements of the wireless communication device during at least one time period, wherein the cell measurements fulfill at least one criterion being lower than the standard cell-reselection criteria.
4. Method according to claim 1 , wherein the wireless communication device is further operating with a predictable location profile, whereby the predictable location profile comprises:
a stationary wireless communication device or
a wireless communication device with low mobility, which is moving within the serving base nodes' cell area,
a wireless communication device which moves in a repeated manner.
5. Method according to claim 1 , wherein the data transmission is one of a plurality of periodic data transmission of at least one of the same size.
6. Method according to claim 1 , wherein the power consumption criteria are further based on at least one of:
coverage enhancement level,
HARQ repetitions,
mean power consumption for at least one data transmission,
received signal strength of the base node,
path-loss,
accumulated receive time including data confirmations and listening to paging occasions,
number of paging occasions.
7. Method according to claim 1 , wherein the comparison takes into account a predefined reselection power threshold, wherein the cell reselection is only carried out if the power consumption of the second base node is higher by said reselection power threshold than the power consumption of the first base node.
8. Method according to claim 7 , wherein the reselection power threshold is updated based on a signal received at the wireless communication device from the cellular network.
9. Wireless communication device operating in a cellular network with a first base node of the cellular network, configured to
operate in enhanced coverage mode;
determine power consumption criteria, based on at least coverage enhancement repetitions, associated with at least one first time period containing at least one data transmission;
carry out a data transmission session;
switch from operating with the first base node to operating with a second base node of the cellular network, after carrying out the data transmission session;
determine power consumption criteria, based on at least coverage enhancement repetitions, associated with at least one second time period containing at least one data transmission on the second base node, wherein said second time period occurs after said first time period and is equal in length to the first time period;
compare the power consumption criteria, based on the at least coverage enhancement repetitions, associated with the first time period with the power consumption criteria, based on the at least coverage enhancement repetitions, associated with the second time period;
carry out a cell reselection to the first base node upon determining, based on said comparison, that the power consumption criteria, associated with the first time period, indicates a lower power consumption than that associated with the second time period.
10. Wireless communication device according to claim 9 wherein the switch from the first base node to the second base node is carried out in response to a reception of a re-direction signal transmitted from the first base node.
11. Wireless communication device according to claim 9 , configured to operate with a predictable location profile, wherein the predictable location profile comprises:
the wireless communication device being stationary, or
the wireless communication device with low mobility, which is moving within the serving base nodes' cell area,
the wireless communication device being configured to move in a repeated manner.
12. Wireless communication device according to claim 9 , wherein the power consumption criteria are further based on at least one of:
HARQ repetitions,
mean power consumption for at least one data transmission,
received signal strength of the base node,
path-loss,
accumulated receive time including data confirmations and listening to paging occasions,
number of paging occasions,
coverage enhancement level.
13. Wireless communication device according to claim 9 , further configured to take into account for the comparison of power comparison criteria a predefined reselection power threshold,
wherein the cell reselection is only carried out if the power consumption of the second base node is higher by said reselection power threshold than the power consumption of the first base node, and where wireless communication device is further configured to update the reselection power threshold based on a signal received from the cellular network.
14. Cellular network for wireless communication, comprising of a plurality of base nodes configured to each operate a plurality of wireless communication devices, configured to re-direct in conjunction with a data transmission session from a wireless communication device from the first base node to the second base node, wherein the re-direction is carried out in response to a change in the network topology.
15. Cellular network according to claim 14 , further configured to detect load differences between at least two of the plurality of base nodes, and in case of a detected load difference transmit a message indicating a reselection power threshold to at least one of the wireless communication devices operating with one of the at least two base nodes.