Abstract
For wireless networks that transmit synchronization signals allowing user equipment to synchronize to cells within the network and transmit reference signals allowing user equipment to determine cell identities a method and apparatus taught herein advantageously link the synchronization signal sequences to the reference signal sequences according to a defined mapping. The linkingsimplifies the cell search process by allowing user equipment to determine cell identities based on mapping detected synchronization signal sequences to the corresponding reference signal or to the corresponding subset of referencesignals in embodiments where there are more reference signal sequences than synchronization signal sequences.In at least one embodiment the network is a 3G LTE network and at least the Primary Synchronization Signal(P-SyS) sequences are linked to the Downlink (DL) reference symbol sequences according to a defined mapping thereby allowing to user equipment to determine cell identities from detected P-SySsequences.
For wireless networks that transmit synchronization signals allowing user equipment to synchronize to cells within the network and transmit reference signals allowing user equipment to determine cell identities a method and apparatus taught herein advantageously link the synchronization signal sequences to the reference signal sequences according to a defined mapping. The linkingsimplifies the cell search process by allowing user equipment to determine cell identities based on mapping detected synchronization signal sequences to the corresponding reference signal or to the corresponding subset of referencesignals in embodiments where there are more reference signal sequences than synchronization signal sequences.In at least one embodiment the network is a 3G LTE network and at least the Primary Synchronization Signal(P-SyS) sequences are linked to the Downlink (DL) reference symbol sequences according to a defined mapping thereby allowing to user equipment to determine cell identities from detected P-SySsequences.
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| 5G | 18/05/2017 | ISLD-201704-009 | ERICSSON INC | No | Family Member | ||||
Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration Synchronization
Product
Base Station (eNB/gNB)
Use Cases
Wireless communication
Services
Cell Search/Switching
Claim
1. A method of facilitating a cell search process in a wireless communication network that transmits synchronization signals to allow user equipment to synchronize with cells and transmits reference signals to allow user equipment to detect cell identities, the method comprising: defining a set of synchronization signal sequences to be used for generating individual ones of the synchronization signals; defining a set of reference signal sequences to be used for generating individual ones of the reference signals; and linking the synchronization signal sequences to the reference signal sequences according to a defined mapping to thereby enable user equipment to determine cell identities based on mapping detected synchronization signal sequences to corresponding reference signal sequences according to the defined mapping.
2. The method of claim 1 , wherein the wireless communication network comprises a Third Generation (3G) Long Term Evolution (LTE) network, the synchronization signals comprise Primary Synchronization Signals (P-SySs), and the reference signals comprises Downlink (DL) reference symbols.
3. The method of claim 2, wherein the synchronization signals further comprise Secondary Synchronization Signals (S-SySs), each cell in the network transmitting a P-SyS and an S-SyS, and wherein linking the synchronization signal sequences to the reference signal sequences according to a defined mapping comprises linking unique combinations of P-SySs and S-SySs to one or more individual reference signal sequences.
4. The method of claim 1 , wherein defining a set of synchronization signal sequences to be used for generating individual ones of the synchronization signals comprises defining as many synchronization signal sequences as reference signal sequences, and wherein linking the synchronization signal sequences to the reference signal sequences according to a defined mapping comprises adopting a one-to-one mapping between synchronization signal sequences and reference signal sequences.
5. The method of claim 1 , wherein defining a set of synchronization signal sequences to be used for generating individual ones of the synchronization signals comprises defining more synchronization signal sequences than reference signal sequences, and wherein linking the synchronization signal sequences to the reference signal sequences according to a defined mapping comprises, for one or more of the reference signal sequences, mapping more than one synchronization signal sequence to the same reference signal sequence.
6. The method of claim 1 , wherein defining a set of synchronization signal sequences to be used for generating individual ones of the synchronization signals comprises defining fewer synchronization signal sequences than reference signal sequences, and wherein linking the synchronization signal sequences to the reference signal sequences according to a defined mapping comprises, for one or more of the synchronization signal sequences, mapping more than one reference signal sequence to the same synchronization signal sequence.
7. A method of cell searching by a user equipment operating in a wireless communication network that transmits synchronization signals to allow user equipment to synchronize with cells and transmits reference signals to allow user equipment to detect cell identities, the method comprising: storing mapping information that links synchronization signal sequences used in generating the synchronization signals to reference signal sequences used in generating the reference signals; detecting the synchronization signal sequence of a received synchronization signal; and determining a cell identifier for a cell associated with the received synchronization signal based on mapping the detected synchronization signal sequence to a reference signal sequence according to the stored mapping information.
8. The method of claim 7, further comprising confirming the cell identifier by detecting a reference signal sequence of the cell and comparing the detected reference signal sequence with the reference signal sequence determined from the stored mapping information.
9. The method of claim 7, wherein the stored mapping information defines a one-to-one mapping between the synchronization signal sequences and the reference signal sequences, and wherein determining the cell identifier comprises using the stored mapping information to identify the one reference signal sequence that corresponds to the detected synchronization signal sequence
10. The method of claim 7, wherein the stored mapping information defines a one-to-many mapping between the synchronization signal sequences and the reference signal sequences, and wherein determining the cell identifier comprises using the stored mapping information to identify a subset of reference signal sequences that correspond to the detected synchronization signal sequence, and determining the cell identifier based on performing detection processing for received reference signals corresponding to the subset of reference signal sequences
11. The method of claim 7, wherein detecting the synchronization signal sequence of a received synchronization signal includes concurrently receiving synchronization signals from two or more cells, and wherein determining the cell identifier comprises determining the cell identifier for a strongest one of the two or more received synchronization signals
12. The method of claim 7, wherein detecting the synchronization signal sequence of a received synchronization signal includes concurrently receiving synchronization signals from two or more cells, and wherein determining the cell identifier comprises determining the cell identifiers for selected ones of the two or more received synchronization signals to identify handoff candidates
13. The method of claim 7, wherein the user equipment is configured for operation in a Third Generation (3G) Long Term Evolution (LTE) network and the synchronization signals comprise Primary Synchronization Channel (P-SyS) signals, and wherein storing the mapping information comprises storing linking information that links particular ones in a set of scrambling code sequences used to generate the Primary Synchronization Channel signals to particular ones in a set of reference signal sequences according to a defined mapping
14. A user equipment comprising: a receiver circuit for receiving a synchronization signal from a cell of a supporting wireless communication network; a memory for storing mapping information that links synchronization signal sequences to reference signal sequences that correspond to cell identifiers for cells in the network; and one or more processing circuits configured to detect a synchronization signal sequence of the received synchronization signal and determine a cell identifier for the cell based on mapping the detected synchronization signal sequence to a reference signal sequence according to the stored mapping information
15. The user equipment of claim 14, wherein the one or more processing circuits are configured to confirm the cell identifier by detecting a reference signal sequence of the cell and comparing the detected reference signal sequence with the reference signal sequence determined from the stored mapping information
16. The user equipment of claim 14, wherein the stored mapping information defines a one- to-one mapping between the synchronization signal sequences and the reference signal sequences, and wherein the one or more processing circuits are configured to determine the cell identifier by using the stored mapping information to identify the one reference signal sequence that corresponds to the detected synchronization signal sequence
17. The user equipment of claim 14, wherein the stored mapping information defines a one- to-many mapping between the synchronization signal sequences and the reference signal sequences, and wherein the one or more processing circuits are configured to determine the cell identifier by using the stored mapping information to identify a subset of reference signal sequences that correspond to the detected synchronization signal sequences, and determine the cell identifier based on performing detection processing for received reference signals corresponding to the subset of reference signal sequences.18. The user equipment of claim 14, wherein the user equipment concurrently receives synchronization signals from two or more cells, and wherein the one or more processing circuits are configured to determine the cell identifier by determining the cell identifier for a strongest one of the two or more received synchronization signals.19. The user equipment of claim 14, wherein the user equipment concurrently receives synchronization signals from two or more cells, and wherein the one or more processing circuits are configured to determine the cell identifiers for selected ones of the received synchronization signals, to identify handoff candidates for the user equipment.
20. The user equipment of claim 14, wherein the user equipment is configured for operation in a Third Generation (3G) Long Term Evolution (LTE) network and the synchronization signals comprise Primary Synchronization Signals (P-SySs), and wherein the one or more processing circuits are configured to store the mapping information as linking information that links particular ones in a set of code sequences used to generate the P-SySs to particular ones in a set of reference signal sequences according to a defined mapping.
21. The user equipment of claim 20, wherein the synchronization signals further comprise Secondary Synchronization Signals (S-SySs), each cell in the supporting wireless network transmitting a P-SyS and an S-SyS, and wherein the one or more processing circuits are configured to store the mapping information as linking information that links unique combinations of P-SySs and S-SySs to one or more individual reference signal sequences.']
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.